The spire above the tower is composed of eight stages of elaborate octagonal structure, linked together by interlaced arches and pinnacles, which contain a stairway to the lantern at the top. Originally the lantern was topped by a statue of the Virgin Mary, the patron saint of the cathedral, but in 1488 it was replaced by a fleuron, or flower-shaped ornament. This is crowned by the cross, which is surrounded by four smaller crosses and images of the host and chalice, elements of the liturgy of the Eucharist.