The earliest surviving Anglo-Saxon architecture dates from the 7th century, essentially beginning with Augustine of Canterbury in Kent from 597; for this he probably imported workmen from Frankish Gaul. The cathedral and abbey in Canterbury, together with churches in Kent at Minster in Sheppey (c.664) and Reculver (669), and in Essex at the Chapel of St Peter-on-the-Wall at Bradwell-on-Sea (where only the nave survives), define the earliest type in southeast England. A simple nave without aisles provided the setting for the main altar; east of this a chancel arch, perhaps a triple arch opening as at Reculver, separated off the apse for use by the clergy. However there is no surviving complete 7th-century church with an apse. Flanking the apse and east end of the nave were side chambers serving as sacristies; further porticus might continue along the nave to provide for burials and other purposes. Exceptions to this include the Old Minster, Winchester.