I will take Coptic Orthodox, being a Coptic Orthodox myself.
Coptic is the race of true Egyptian , the descendents of the Pharaoh (not necessarily the kings, but the nation who populated Egypt thousands of years B.C.). We have the oldest civilization of the World, dating back to 5000 b.c. . The word itself means "Egyptian".
We became christian, when St.Mark, the blessed Apostle, the author by inspiration of the Holy Spirit of the Gospel of Mark, entered Egypt for Evangelism around 40 a.c. and christianity spread quickly in Egypt. He established the Church of ALexandria and we are his children in Faith.
Orthodoxy is our christian "denomination", or faith. What we inherited from St.Mark we still practice and believe till today, without change or alteration.
The legacy of the Coptic Church is its richness in theology, matryrs, and the perservation of true Faith as handed down to the APostles (Jude 3). The Coptic Orthodox Church has millions of martyrs, during different eras of persecution. In addition, the school Alexandria, which had among its graduates the top theologian of the Old Christian World, has had a great influence on the christian World.
Currently , we are about 15 millions Coptic Orthodox christian in Egypt, under persecution and discrimination from the muslim majority.
Our church is the first church to introduce Monasticism , and the first monk, St. Antony the Great, is a Coptic Egyptian who established monasticism in Egypt and then it spread to all the World. Our church is the only church prophesized about (by location) in the book of Isaiah . "In that day there will be an altar to the LORD in the heart of Egypt, and a monument to the LORD at its border. (Isaiah 19:19)....
You can visit the following sites to know more about the Coptic Orthodox Church:www.suscopts.org
(contains good links for Coptic culture, hymnology, orthodox faith,.....etc.)www.coptichymns.net
(has a good forum)
For books about our Church and Orthodoxy in general, visit:www.orthodoxbookstore.org
I should mention in the end that we had our lines of Popes since St.Mark preached in Alexadria and became our first Pope. We were never under Roman Church or any other See's authority. We are among the original Sees in christianity.
Hope this helps.