The 14th-century rebuilding of the collegiate church of St Mary's by the earls of Warwick has received surprisingly little scholarly consideration, despite the status of its patrons and the distinctiveness of its architecture. This article uses drawings of the building before the fire of 1694, which destroyed its west end, together with the college's extensive cartulary and other records, to reconstruct the 14th-century church. From this a timeline for the construction of the church is proposed. Regional, national and international stylistic precedents and antecedents are explored and used to test the validity of the 'centre/periphery' model of architectural change. The article concludes with a brief discussion of methodological insights drawn from the analysis.