From the mid-8th century to the mid-10th century, several important buildings survive. One group comprises the first known churches utilizing aisles: Brixworth, the most ambitious Anglo-Saxon church to survive largely intact; Wareham St Mary's; Cirencester; and the rebuilding of Canterbury Cathedral. These buildings may be compared with churches in the Carolingian Empire. Other lesser churches may be dated to the late eighth and early ninth centuries on the basis of their elaborate sculptured decoration and have simple naves with side porticus. The tower of Barnack hearkens to the West Saxon reconquest in the early 10th century, when decorative features that were to be characteristic of Late Anglo-Saxon architecture were already developed, such as narrow raised bands of stone (pilaster strips) to surround archways and to articulate wall surfaces, as at Barton-upon-Humber and Earls Barton. In plan, however, the churches remained essentially conservative.