sentences:  Gothic side-chapels were added to either side of the lower end of the nave; the last side-chapel, dedicated to the Assumption, was built between 1522 and 1530.At about the same time the cloister was entirely rebuilt in the Flamboyant style, of which it is a spectacular example.On 2 April 1755, the roof and towers were set on fire by a bolt of lightning; the spires were never replaced.