St Mark's Basilica (Basilica di San Marco in Italian) is the most famous of the many churches of Venice and one of the finest examples of Byzantine architecture in the world. Located just off the Grand Canal, the gleaming basilica overlooks the Piazza San Marco (St. Mark's Square) and adjoins the Doge's Palace. San Marco is a cathedral, but has not always been so: it was the Doge's chapel until it became the seat of the Archbishop of Venice in 1807.n 828, Venetian merchants stole the relics of Saint Mark the Evangelist from their original resting place in Alexandria, Egypt. It is said the Venetians hid the relics in a barrel under layers of pork to get them past Muslim guards. The adventure is depicted in the 13th-century mosaic above the door farthest left of the front entrance of the Basilica.The relics were initially housed in a temporary chapel within the Doge's Palace, but a more substantial church was built to shelter the valuable relics in 829-32. This burned in a rebellion against Doge Pietro Candiano IV in 976, but was restored by Doge Domenico Contarini (d. 1070). The present basilica, which incorporates the earlier buildings, was completed around 1071.