Synods of Westminster were certain of the more important ecclesiastical councils held within the present bounds of London. Though the precise locality is occasionally uncertain, the majority of the medieval synods assembled in the chapter-house of old St Paul's, or the former chapel of St Catherine within the precincts of Westminster Abbey or at Lambeth. The councils were of various types, each with a constitutional history of its own. Before the reign of Edward I, when convocation assumed substantially its present form, there were convened in London various diocesan, provincial, national and legatine synods; during the past six centuries, however, the chief ecclesiastical assemblies held there have been convocations of the province of Canterbury.