[3] It is believed that the saint founded a church on the site before the construction of the present medieval building.

[2] The present church is dated to the mid to late 13th century,[4] when it was built as part of St Crallo's College.

[10][b] Since the nave had relatively little damage, a temporary wall was built at its east end to allow the church to conduct services.

[5] Newman describes the St Crallo's as 'large and impressive' while E. A. Freeman, writing in 1857, suggested that the building would make 'an admirable model for small colonial church'.

[15] The church contains a memorial to lexicographer Thomas Richards, a 14th-century tomb chest featuring an effigy of praying monk with fine detail on a plain tomb chest,[4] and an 18th-century memento mori tablet on the western wall dedicated to Richard Howell.