Cresconius (Spanish: Cresconio) (c. 1036 – 1066) was a bishop of Iria Flavia and Santiago de Compostela during the eleventh century. He succeeded Vistruarius (Vistruario).http://en.wikipedia.org/wiki/Cresconius_(Bishop_of_Iria
Cresconius believed that, because Santiago was the burial place of Saint James the Greater, that his see naturally occupied a superior place amongst the dioceses of the West as an "apostolic see." To this end, he proclaimed himself Episcopus Iriensis et Apostolicae Sedis. However, this assumption was not supported by Rome and Pope Leo IX excommunicated him at the Council of Rheims (1049). Nevertheless, Cresconius continued using this title, and the bishops of Lugo, Dumio, Oviedo, and Oporto acknowledged his authority and primacy.
In 1060, he presided over the Council of Compostela where he prohibited the use of weapons by clerics, and also forbade that clerics be married. He opened parochial schools and fought pagan superstitions that dated to even before the Roman conquest of Galicia.
Now I wonder if he really "proclaimed himself" or, since tradition acknowledged Santiago of Compostela to be the burial place of St. James, if it was a veritable Apostolic See that was crushed by the rising papal power.