The Iron Age is the last of the Three Ages of British later prehistory. It begins with the arrival of the new metal, iron, around 800 BC and ends with Roman troops landing on the shores of Kent, in AD 43. The Romans gave the British writing and with writing came recorded history – which is why prehistory is said to cease with their arrival. People in Iron Age Britain are sometimes described as Celts and they spoke Celtic languages, which survive today in Breton, Welsh, Gallic (Scotland) and Gaelic (Ireland). The working of iron requires greater control of very high temperatures which led to improvements in pottery firing and less regionalised pottery styles. The Iron Age saw the appearance of ditched enclosed farmstead-type settlements as at Itter Crescent, open settlements characterised by roundhouses and pits as at Fengate, and the building of the hillforts like the earthworks at Newborough. Societies were hierarchically organised in this period, having moved from the extended clan to the chiefdoms and the earliest named rulers. These are the tribes the Romans encountered when they came to Britain in the first century. The best known of these rulers was Queen Boudicca of the Iceni tribe/kingdom. She led a popular rebellion against Roman rule, in AD 60-1.
Environmentally, the Iron Age sees increased flooding and higher groundwater levels in the fens.