Periods

All periods ( 500000 b.c. to 2100 a.d. )	Sites
Prehistory ( 500000 b.c. to 43 a.d. ) Roman ( 43 a.d. to 410 a.d. ) Anglo-Saxon ( 410 a.d. to 1066 a.d. ) Medieval ( 1066 a.d. to 1540 a.d. ) Post Medieval ( 1540 a.d. to 1901 a.d. ) 20th Century ( 1901 a.d. to 2000 a.d. ) 21st Century ( 2001 a.d. to 2100 a.d. )