The island was the site of a
castle from at least the 6th century, and it is from this that the island and the sestiere are named. In the seventh century, it became the seat of the
Bishop of Olivolo, later renamed Bishop of Castello. When Castello was merged into the
Roman Catholic Archdiocese of Venice it remained the seat of that archdiocese until 1807. The
Church of San Pietro was the seat from the ninth century, while other attractions on the island include a
campanile with a ring of bells in C, and the greenery of the
Campo San Pietro. ==Gallery==