 The nave consists of three simple bays, with single bays on either side of a crossing forming a transept, followed by a single-bay choir, backed by an apse.The cathedral was originally dedicated to the Virgin Mary but in 396 Saint Martin, the Archbishop of Tours, added Saint Maurice to the dedication.He had acquired a relic of some of the blood of the members of the Theban Legion, who were martyred, along with their leader Saint Maurice, in the 3rd century for converting to Christianity.