One of Brittany's finest cathedrals, dating principally from the 14 and 15C. Three towers stand on the transept. On the south side is an attractive «bell portico», surmounted by a flamboyant window. The Romanesque Hastings Tower dates from the 12C. The interior of the church is exceptional. It has 46 Renaissance stalls and 15C sculpted funeral recesses representing knights in armour. The treasury and cloister are also worth a look.