For 10 points, name this basilica, seat of the Patriarch of Venice.
An enthroned God watches over the placement of Mary on her bier in Andrea del Castagno's Death of the Virgin, a mosaic in the Capella Nova in this church, and many scenes from the life of this church's namesake appear in its Zen Chapel. Eight saints, including Blaise, Nicholas, and Thecla, are depicted in the sparse mosaic of the Leonard Cupola, one of five domes in this cathedral. This basilica's presbytery is home to a marble seat, transferred from nearby Aquileia, in which this basilica's namesake is said to have composed his gospel on wax tablets. Sculptures in porphyry of the Tetrarchs and four bronze horses, taken from the Hippodrome, are among the works in this basilica taken from the sacking of Constantinople by the Fourth Crusade. For 10 points, name this basilica, seat of the Patriarch of Venice. 
An enthroned God watches over the placement of Mary on her bier in Andrea del Castagno's Death of the Virgin, a mosaic in the Capella Nova in this church, and many scenes from the life of this church's namesake appear in its Zen Chapel.
{Saint Mark's} Basilica [or Basilica {di San Marco}]