The church was severely damaged in the Great Fire of 1212. Rebuilding took place during the thirteenth century, although the exact dates are unknown. In its reconstructed state – the basic layout of which survives today – the church was cruciform in plan, with an aisled nave of six bays, a crossing tower, transepts, and a five bay choir. Beyond the choir stood a lower retrochoir or Lady chapel, the form of which can also be interpreted as group of four chapels with separate gabled roofs, two opening from the choir, and two from each aisle.