Question: St Mark's Campanile is the bell tower of a basilica that lies at which end of Piazza San Marco ?
Sentence (from "St Mark's Basilica"): Originally it was the chapel of the Doge, and has only been the city's cathedral since 1807, when it became the seat of the Patriarch of Venice, archbishop of the Roman Catholic Archdiocese of Venice, formerly at San Pietro di Castello.
Relevant evidence: No