landscape, dependent on imperial military requirements and requirements of administration and tax collection; the exceptions are a handful of sites: Londinium, Eboracum, Canterbury, Wroxeter and possibly Cambridge, but the discontinuity in the episcopate, "the institution most responsible for the survival of towns in Gaul", as H. R. Loyn observes, speaks against town survival in Britain. The Roman villa system, represented by some five hundred archaeological sites, did not survive either; unlike Gaul, in Britain not a single villa name survived into the Germanic period (however, at Chedworth villa a mosaic within Room 28, discovered in 2020, was designed and created in the middle of the 5th century). It may be possible that the villa system did not survive the disastrous Pictish incursions in 367 and following years. In the sub-Roman period, building in stone came to an end; buildings were constructed of less durable materials than during the Roman period. However, brooches, pottery, and weapons from this period have survived. The study of burials and cremations, and the grave goods associated with these, has done much to expand the understanding of cultural identities in the period. Archaeology has shown some evidence of continuity with Roman education, trade with the Mediterranean, and with Celtic art. Excavations of settlements have revealed possible changes in social structures, and to what extent life in Britain continued unaltered in certain pockets into the early medieval period. Hilltops, the so-called "hillforts", castra, and monasteries have been excavated. Work on towns has been particularly important. Work on the hill-forts has shown evidence of refurbishment, and also of overseas trade, in this period. One of the earliest major excavations was at Tintagel (Radford 1939). This uncovered rectangular structures and much Mediterranean pottery. The buildings were initially interpreted as a monastery, but later as a princely stronghold and trading post. Another important excavation was at Dinas Powys (Alcock 1963) which showed evidence of metalworking. Alcock also led the excavations at South Cadbury (Alcock 1995). Many other sites have now been shown to have been occupied during the sub-Roman period, including Birdoswald and Saxon Shore forts. Work on field systems and environmental archaeology has also highlighted how much agricultural practice continued and changed over the period. Archaeology has confirmed Germanic burials at Bowcombe and Gatcombe on the Isle of Wight that took place at least 50 years before the dates suggested by historical sources, concurrent with Honorius's award of land