c.1500 - Farms (houses and separate, walled fields) in use on Dartmoor (Devon) and in uplands of Wales; stone circles seem to fall into disuse and decay around this time, perhaps due to a re-orientation of the society's religious attitudes and practices; burial mounds cease to be constructed; burials made near stone circles or in flat cemetaries.

    c.1200-1000 - Emergence of a warrior class who now begins to take a central role in society. Some believe that these people, also known as the Urnfield civilization, are the "proto-Celts."

    c.1100 - Geoffrey of Monmouth suggests that Brutus arrives about this time.

    c.1000 - Earliest hill-top earthworks ("hillforts") begin to appear, also fortified farmsteads; increasing sophistication of arts and crafts, particularly in decorative personal and animal ornamentation.

    c.600 - Iron replaces bronze, Iron Age begins; construction of Old Sarum begun.

    c.500 - Evidence of the spread of Celtic customs and artefacts across Britain; more and varied types of pottery in use, more characteristic decoration of jewelry. There was no known invasion of Britain by the Celts; they probably gradually infiltrated into British society through trade and other contact over a period of several hundred years; Druids, the intellectual class of the Celts (their own word for themselves, meaning "the hidden people"), begin a thousand year floruit.

    c.150 - Metal coinage comes into use; widespread contact with continent.

    c.100 - Flourishing of Carn Euny (Cornwall), an iron age village with interlocking stone court-yard houses; community features a "fogou," an underground chamber used, possibly, for storage or defense.