I say leave it up to the Russians. I do have to admit however, that I did imagine a Russian wedding of equal note and dignity coming out of the Cathedral of Christ the Saviour in Moscow in my mind as I was half awake this morning.
One has to remember however that by the 20th century, the Royal Families of Europe were Royals first and religious folks second. The last Tsarina was widely regarded, and rightly so, as a German interloper by many Russians. By that I mean that they were so-intermingled by marriage and politics that faith had little to do with their function other than in a ceremonial manner. Religion was no obstacle to a marriage, the Houses of all of the warring parties of the 19th and 20th centuries were for the most part all descendants of Queen Victoria and the sitting Crowned heads were first or second cousins. Orthodoxy, Catholicism, Lutheranism, Evangelical and Reformed - it made no difference. It can be said that the Royals of Europe had become the first 'ecumenists' by 1900.
In that context it is hard to imagine the religious wars that occurred throughout the middle ages and into the early enlightenment over Church, state and faith.
The last 'Orthodox' monarch, King Constantine of Greece is the godfather of the new Duke of Cambridge. His sister sits on the throne of Isabella as the Most Catholic Queen of Spain. There is an interesting discussion on this Yahoo thread on the subject.http://answers.yahoo.com/question/index?qid=20101112102148AAhbjme
Just to go back when the wars of religion had puttered out in Europe, Czarina Catherine the Great (whose own devout Lutheran father strongly opposed her conversion to Orthodoxy, sent her Protestant polemical and apologetic works, and, after she fell gravely ill and sent for an Orthodox priest rather than a Protestant pastor, did not come to her wedding in Russia), when King Gustaf IV of Sweden declared his love for her granddaughter Alexandra and asked for her hand, the Empress agreed but insisted at the betrothal in Russia that the new queen of Sweden be guarenteed her freedom to retain her Orthodox Faith. When Gustaf refused, he left Russia without his bride, and Catherine died from stress brought on by the row. Catherine and the Orthodox had the last laugh: just over a decade later Gustaf and his dynasty was deposed and Russia took half of his kingdom. Alexandra married into the Hapsburgs (Joseph of Hungary), who refused to bury her when she died (though Joseph built her a mausoleum), because she had not submitted to the Vatican.
Things didn't change as the Orthodox threw off the Turkish yoke. The first king of the new Greece refused to part from the Vatican, and he married a Lutheran, who introduced the Christmas tree into Greece. King Otto took the role of head of the autocephalous Church of Greece, and his wife Amelia was the one who performed the formal process of receiving and implementing the Tomos issued by Constantinople. Greece adopted a constitution which required all heirs to profess Orthodoxy, but the Vatican-Lutheran royal pair failed to produce an heir, and were deposed for violating the Constitution before his brothers, also loyal to the Vatican, could inherit.
The new King of Romania Carol, also a dutiful son of the Vatican married to a Lutheran (Otto and Carol/Karl were at least German, like their wives) only had a daughter, presumably baptized Orthodox but dying in infancy, and his Vatican loyal nephew Ferdinand I not only succeeded without chrismation by the Orthodox, but he concluded an unconstitutional concordant with the Vatican and recognized the "Romanian Greek Catholic Church United with Rome" as the successor of the Habsburgs in the lands his kingdom obtained after WWI. he had attempted to marry a Romanian Orthodox, but the constitution forbade heirs to the throne from marrying, and his intended was exiled to France and even the Queen for two years to Germany for encouraging the match. Ferdinand's eventual wife Marie was Lutheran when he married her, though she was baptised at Windsor (as the granddaughter of Queen Victoria) Anglican with the Princesss of Wales (sister-in-law of her father, and sister of the King of Greece and the wife of the Russian Czarovich) the Russian Orthodox Empress and Czarvich (her mother's mother and brother) as godparents: her father had been the choice of the Greeks to succeed Otto, but the English blocked that and he ended up Duke of Saxe-Coburg and Gotha (at which point she became Lutheran); she is rumored to have reverted to her mother's Orthodox Faith when becoming queen of Romania, but then she supposedly converted to Bahai'ism, the first royal anywhere to do so. Her children were not so flighty: her son Carol II was baptized Orthodox as was the rest of his family by his Romanian Orthodox first wife (Carol had originally defied Romanian law and married a Romanian Orthodox, fleeing across the border to do so in Odessa Cathedral. King Ferdinand responded, once he got his hands on Carol, by confinng him to a monastery and having the Romanian Supreme Court annul (reversed in 1996) the marriage (to which Carol responded by renouncing his rights of succession), exiling the wife Zizi to France (with Carol's son), and throwing women at Carol to dissuade him from the marriage while forcing the marriage to Princess Elena) and the Orthodox Elena of Greece, who produced the heir King Michael I In the end Carol renounced his rights in favor of Michael, in favor of running off with one of the mistress he had taken during his "re-education"; Carol's brother Nicolae acted as regent during Michael I's minority as king, but when Carol returned to Romania, Nicolae supported his restoration to succeed to the throne, and then Nicolae too broke the law by marrying a Romanian Orthodox, for which he was stripped of his titles and exiled to France; Carol's sister Elisabeth married his brother-in-law King George II of Greece; another sister Marie married the King of Yugoslavia and produced his heir King Peter I. Only the sister Ileana married a non-Orthodox, a Habsburg cousin of Catherine the Great's grandson-in-law, but she ended up in the Orthodox monastery of the Protection of the Mother of God in France and later, as Mother Alexarndra, founding the monastery of the Transfiguration in PA.
The Lutheran King who replaced Otto in Greece, George I, founded a dynasty on even stronger Orthodox ties:thanking his brother-in-law, the Czar, for placing him on the throne, he met, fell in love with, and married the Czar's cousin Olga in the chapel of the Winter Palace. Their children were all baptized Orthdoox, the sons of course remaining Greek Orthodox and the daughter Princess Alexandra married the Czar's uncle Paul, and the other Princess Marie married the Czar's cousin George (who had tried to marry a Georgian Orthodox Princess but had been forbidden, and had been thwarted in marrying the future Queen Marie of Romania: Marie of Greece turned down the future King Alexander I of Serbia in favor of George). A brother Prince Nicholas married the Czar's cousin Elena: their daughter Olga married the Serbian Orthodox Prince Paul, regent for King Peter II, another daughter Marina became the Duchess of Kent but only after their Westminster wedding was followed by a Greek Orthodox marriage in the chapel at Buckingham Palace (I don't know about the religious fate of the third daughter Elisabeth). Another son Andrew married Alice of Battenburg in civil, Lutheran (odd since she was confirmed Anglican) and Orthodox ceremonies and had Prince Philip, so that Alice retired as an Orthodox nun (imitating St. Elizabeth the neo-martyr, her aunt) in Buckingham Palace, and was buried by her request on the Mount of Olives next to St. Elizabeth in the convent of St. Mary Magdalene (she is also honored nearby in Yad Vashem for all the Jews she hid in Greece).
In newly independent Serbia, the first King Milan I married the daughter of an Romanian Orthodox boyar in the service of the Russian Czar (though Milan carryied on an affair with the mother of Winston Churchell). Their son King Alexander I married a local Serbian Orthodox widow. When they were both assassinated, bringing an end to the dynasty, they were succeeded by King Peter I, whose father Alexander had preceeded King Milan in ruling Ottoman Serbia: Alexander married Peter's mother, a Serbian Orthodox, while in exile in Russian governered Moldavia/Romania, and all of their children married Serbian and Russian Orthodox. Peter married the Montengrin Orthodox (at the time, Montenegro was canonically autocephalous) Princess Zorka: their son and successor Alexander I (the spurned suitor of Marie of Greece above) married the Orthodox Princess Marie of Romania (daughter of Queen Marie the Bahai mentined above) and Peter's daughter Princess Elena who married the Czar's cousin John Romanov (who had considered becoming an Orthodox monk before falling in love with Elena, and who remained deeply religious).
Zorka's father, King Nicolas I of Montenegro, descended from a line of Orthodox Metropolitans which passed from uncle to nephew or between brothers under secularized in a royal dynasty. He was the father-in-law of Europe, Zorka's sister Milica marrying Grand Duke Peter Romanov, Anastasis marrying in succession two grandsons of Czar Nicholas I in Russia; their brother Mirko married a Serbian Princess (King Milan's grandniece and King Alexander's cousin: Mirko was the heir of King Alexander I before King Peter I succeeded), brothers Danilo and Peter married Protestants who converted to Orthodoxy. A sister, Princess Ana married the Protestant brother of the Prince of Bulgaria, but in both in a Protestant and an Orthodox ceremonies. Onlly the sister Elena apostacized, submitting to the Vatican to become the Fascist Queen of Italy.
Her daughter Giovanna married Boris I of Bulgaria, whose father Ferdinand I was forced to have Boris again in the Orthdoox Faith after being baptised in his own faith in the Vatican. When the Vatican excommunicated him for doing so, Ferdinand refused to baptize any further children in the Orthodox Church. Giovanna married Boris in a ceremony conducted by the Vatican, but on returning to Bulgaria, in the Orthodox Church, which revived the problems that Czar Ferdinand had: she had the help of the papal nuncio to Bulgaria, the future Pope John XXIII, to lift the excommunication. Their son Simeon, the last Bulgarian Czar and later post-communist Prime Minister, married someone of his mother's faith, but the children were baptized Orthodox. Only one of them apostacized, but did have an Orthodox blessing after the wedding ceremony, and baptized their children Bulgarian Orthodox.
In short, the Orthodox sovereigns had a good record of keeping it in the Faith, no matter the ecumenism of their heterodox relatives. This includes the Russian Imperial Family. The last Czarina, now St. Alexandra the passion bearer, was regarded as German interloper by the Russians, but that has more to do with the jealously of the Dowager Czarina (and it is to be remembered, that the Dowager took presidence over the Czarina in Russian protocol: she insisted on walking on her son's arm, with the Czarina walking behind), who hated anything German because of the loss of her native Denmark of territory to the unifying German Empire. Alexandra and Czarovich Nicholas upset the dynasty's plans by falling in love and insisting on marriage, Alexandra's refusal to convert being the only impediment. No other than Queen Victoria herself was promoting the marriage of Alexandra to her cousin and Victoria's grandson and heir Prince Albert, second in line to the British throne. Czar Alexander III was forcing the Czarovich Nicholas to marry Helen of France, Princess of the pretender of the French throne. She however, refused to convert to Orthodoxy (although, she had offered to convert to marry Prince Albert, with whom she had fallen in love, which he reciprocated and offered to renounce his succession to the throne, due to the prohibition of the marriage of heirs to the British throne being married to communicants of the Vatican. Her father the Comte de Paris and Pope Leo of Rome ended the affair, forbidding her conversion. She then tried marrying the heir to the Italian throne in Rome, but was beat out by Princess Elena of Montengro the apostate. This, although Helene was considered the great beauty with grace and intellect of her day), giving Nicholas the leverage to stay away from that match. The Czar then choose Margaret of Prussia, sister of the German emperor, whom Queen Victoria had tried to push on Prince Albert when the match with Alexandra fell through and tried to get his mind off of Helene of France. She, however, also refused to leave Lutheranism for Orthodoxy (her sister, the Crown Princess of Greece having been recently banished from the German Empire by their brother the German Emperor and Summus-Episcopus of the Evanglical Lutheran Church, for doing so: ironically as Greek Queen she too was seen as a German interloper, despite the fact that, on top of her conversion, her parents, raising her to believe in the superioroty of all things English, Queen Sophie was a rabid Anglophile), and Nicholas for his part said he would become a monk rather than marry Margaret. Nicholas insisted on Alexandra, but it was only when Czar Alexander's health began to fail that the Czarovich gained the Czar's permission to marry Alexandra, part of which included inducing Alexandra to convert to Russian Orthodoxy, something she was reluctant to do (but later became a fervant convert, due to Nicholas' persistence, as shown in her writings, and the urging of her sister (St.) Elizabeth (the Neo-Martyr) who had converted after initial resistence, although not required). The circumstances of the match, however, made Alexandra the focus of all the hatred of Czar Alexander and Czarina Maria's hatred for anything German, and when it happened that she arrived when the Czar died, coming into the capital as the corpse came in, she was fixated on as a bad omen "She comes to us behind a coffin." The Dowanger Empress Marie never ceased to find fault with her daughter in law's failure to Russify quickly enough-although Alexandra arrived in Russia and became its Empress in less than a month, whereas Marie had 15 years of preparation before she wore Russia's crown-and the court, and then the populace, followed suit. This was exaserbated when Alexandra, unlike most of the Russian aristocracy-took Orthodoxy seriously: she began, when able, to black list the more scandelously dissolute from functions (and they in turn gossiped about the Czarina as a German prude and bore), and when she realized that Orthodoxy did not bind the aristocracy to the people, she reacted to Russian indifference by delving deeply into Orthodox spirituality (which unfortunately made her a ready victim for the "holy man" Rasputin).
Nicholas was the only one of his siblings to marry someone not baptized Orthodox by their families. Of his paternal uncles and aunts, hs aunt Maria married Queen Victoria's second son Alfred in Orthodox rites in St. Petersburg, and brought a Russian Orthdoox priest with her to England, her daughter later becoming the (evidently nominally) Orthodox queen Marie of Romania; his uncle Vladimir married the Lutheran German Princess Marie of Mecklenburg-Schwerin, who refused to convert, holding up the marriage (she broke off an engagement when she met Vladimir) for three years awaiting imperial permission to marry without converting, but then converted to Orthodoxy decades later; his uncle Sergei married the Lutheran Princess Elizabeth of Hesse, who only converted years after the wedding and later became St. Elizabeth the Neo-Martyr; his uncle Paul married Princess Alexandra of Greece, and had Elena later Orthodox Queen of Romania.
Btw, the Protestants were scandalized by Dagmar/Empress Marie renouncing her Lutheranism, and when the German Emperor's sister Sophie, who married the Greek Crown Prince with the understanding that she would remain Lutheran like her father in law King George, when she converted years later to Orthodoxy banned her from Germany.
The Orthodox Church of the East in the Eighteenth Century; being the Correspondence between the Eastern Patriarchs and the Nonjuring Bishops; with an Introduction on various Projects of Re-union between the Eastern Church and Anglican Communion. By George Williams, B.D. Rivingtons. 1868.http://books.google.com/books?pg=PA273&dq=Dagmar%20Christian%20ancestors%20Faith&id=1XVHAAAAYAAJ&output=text
This book is unquestionably interesting. It contains some of the materials for future history, and preserves for general use documents which exist in manuscript only, or in places and books that are very difficult of access. We possess here, in a variety of forms, the outspoken and authentic utterance of the Oriental Churches, and of distinguished Patriarchs, on matters on which they parade the immutability of their ecclesiastical judgment, and the infallibility of their wisdom, of their traditions, and of their synodical action. It is possible to learn from these pages, at no great cost of time, the doctrine, discipline, and temper of the Orthodox Greek Church, to read the proceedings of the tarfamed Synod of Bethlehem, and to obtain much curious information concerning the efforts made by the so-called Nonjuring bishops to secure tho good opinion of their Oriental Holinesscs, and to establish and comfort their own isolation, by the possibility of intercommunion with the Church which like themselves had thrown off the usurpations of Rome, and believed in their Catholic orders and supernatural functions. These and other efforts made at different periods since the Reformation by the High Church section of the Episcopal communion in England are briefly reviewed by our author, who, in his position as chaplain of the late Bishop Alexander, at Jerusalem, has had various opportunities of becoming acquainted with facts; and has clearly groaned over the lamentable consequences to the Church of the pretensions of the Jerusalem bishopric. He represents the party which yearns after Oriental sympathy and smiles, ana believes with obvious earnestness in the great advantages to the Universal Church, of the mutual recognition by Constantinople and Lambeth of their common Catholic Christianity. This dream is born of the irrational delusion of apostolic succession, the violation of which in their own case is the nightmare of their sorry rest. It is explicable. Rome is unbending in her claims, and treats the Anglican hierarchy with precisely the same contempt which they entertain, and often manifest to Nonconformist orders. If Jerusalem and Alexandria would condescend to treat with them as parts of the Catholic Church, a prima facie case would be made out against the exclusive claims of Bome. Hence theircontinuous solicitude after the fulfilment in this way of the Redeemer's prayer for the owners of His Church. Our author exults in the doubtful step taken by the Pan-Anglican Synod, and considers that a great advance has been secured by the unmeaning letter of the late Primate to all the Oriental Churches. This childish coquetting with the effete ecclesiasticism of the East, by men who are compelled through sheer honesty to repudiate much that they long to share, is rather diverting to irreverent Nonconformists, who, however, cannot but feel grieved and wounded. A great section of Christian Englishmen, loving the same Lord, revering the same truth) living before their eyes a holy, God-fearing, consistent life, are resolutely, blindly ignored as non-existent, while the arms of the Church are thrown lovingly round the distant, stiff, brocaded forms of an antique hierarchy, which has no point of living sympathy with it. Even the Nonjuring bishops show to advantage by the side of these haughty ignorant priests of the far East, with their blind infallibility and intolerable self-sufficiency. This is using strong language; for few men ever made themselves more hopelessly ridiculous than the Nonjurors, whose pretentious, pragmatical, officious meddling in this matter was ultimately exposed Dy Archbishop Wake. But if our readers want to delectate themselves with a specimen of consummate snubbing, and to know what the Greek Church demands as the conditions of its favour; to see how these foolish men who imagined themselves to be the only ' Catholic remnant in England,' were made to eat the leek offered them by those who dealt damnation round on all the world, let them peruse the reply of the Patriarchs to the impracticable proposals of the Nonjuring bishops.
If amusement be not the object, and any reader wants to know after what doctrine and discipline our Pan-Anglican Synod is yearning, he may find in this volume the most explicit statements. Transubstantiation is insisted upon with intense eagerness ; and he who will not render latreia to the blessed Sacrament is guilty of blasphemy, and in danger of perdition. The worship [doulia] of saints, and of the immaculate Mother of God, is urged with passionate force. The Liturgy of the Greek Church must be taken entire. The orders of the Anglican bishops must be derived from themselves, and the entire body of traditions, synods, on which they are accustomed to lean, must be accepted without diminution. Of course the ' filioque' must be repudiated as a damnable heresy, and the seven sacraments must be recognised. All other Churches must become incorporated with the Orthodox Greek Church, as it alone has the truth and the order, and the Christ, On reading such a correspondence as this, we bless God, that we approach our Father from another standpoint. We do not say ' this is another faith, another Lord, another ' baptism from ours;' because we believe that at the heart of all Christian profession and life there are great central truths, which are the same for all; but the form becomes so distorted, the letter so triumphant over tho spirit, that at times we find it difficult to see the commonness of the source. We thank Mr. Williams for his book. He is himself outraged at the vows and anathemas which the poor Princess Dagmar was obliged to utter with reference to all her ancestry; and we doubt whether he would endorse the utter loathing that these meek Oriental priests manifest for Lutheran and Calvinistic heresy. At all events, his facts are vastly instructive, whatever he thinks about them.
We are indebted to the "Evening Standard " of Oct. 9th, for the following explanation of what constitutes the holding of a faith. Speaking of the approaching marriage of the Princess Dagmar, of Denmark, with the son of the Bussian Emperor, that paper says: "The marriage of Nicholas with the daughter of King Frederic William III. of Prussia was an incident of no common importance to the Imperial house of Russia. It was the first time that a Princess of the lineage of Hohenzollem had consented to renounce her faith, and to leave her country for the stern grandeur of the Court of St. Petersbnrgh. . . . Princess Dagmar of Denmark also leaves her country, but does not renounce her religion, because she has never been confirmed in the Lutheran faith." Thus, a person cannot hold any faith until confirmed therein by the laying on of the hands of a fellow mortal!http://books.google.com/books?pg=PA40&dq=Dagmar%20age%20renounce%20faith&id=724OAAAAQAAJ&output=text
Constantine, who now comes to the Greek throne, was formerly disliked in his kingdom, but has won popularity by his course as a soldier. Tho he becomes King Constantine I, his name is no novelty in the history of his country. The last Byzantine Emperor, whose reign closed with his death and the taking of his capital by the Turks in 1453, was a Constantine. The new ruler is a tall, soldierly man, reserved in public and private. German tutors educated him, and he is a brother-in-law of the German Emperor, having married at Athens, in 1889, Princess Sophia of Prussia. When the latter became a member of the orthodox Greek Church the Kaiser was offended in his Lutheranism, and it is said that relations have been strained between the brothers-in-law since that time. http://books.google.com/books?pg=PA720&dq=Sophie%20Lutheranism%20Orthodoxy%20Greece&id=9abPAAAAMAAJ&output=text
So in the Orthodox royal lines such indifference had not settled in in 1900: nearly all remained Orthodox, and those who married into and converted nearly all did so from conviction rather than for reasons of state.