The parish church building, dedicated to St Oswald, was built soon afterwards, with Norman architecture dating from the twelfth century evident in the south and west walls of the nave and the north wall of the chancel. Some earlier Saxon material was reused, including a decorated cross shaft, now in the west bay of the nave arcade. The decoration includes serpents, two flying dragons, two figures in conversation, a third figure on horseback, and a runic inscription. The building was modified and partially rebuilt in subsequent centuries, including a major restoration in 1884 by A S Ellis of London, and is now a Grade I listed structure, in recognition of its architectural merit. Crowle developed into a market town in the twelfth and thirteenth centuries, with the support of the Abbot of Selby, and its first market charter was awarded in 1305.