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A major change occurred c. 4000 bc with the introduction of agriculture by Neolithic immigrants from the coasts of western and possibly northwestern Europe. They were pastoralists as well as tillers of the soil. Tools were commonly of flint won by mining, but axes of volcanic rock were also traded by prospectors exploiting distant outcrops. The dead were buried in communal graves of two main kinds: in the west, tombs were built out of stone and concealed under mounds of rubble; in the stoneless eastern areas the dead were buried under long barrows (mounds of earth), which normally contained timber structures. Other evidence of religion comes from enclosures (e.g., Windmill Hill, Wiltshire), which are now believed to have been centres of ritual and of seasonal tribal feasting. From them developed, late in the 3rd millennium, more clearly ceremonial ditch-enclosed earthworks known as henge monuments. Some, like Durrington Walls, Wiltshire, are of great size and enclose subsidiary timber circles. British Neolithic culture thus developed its own individuality.

Ancient Britain.Encyclopædia Britannica, Inc.

Bronze Age

Early in the 2nd millennium or perhaps even earlier, from c. 2300 bc, changes were introduced by the Beaker folk from the Low Countries and the middle Rhine. These people buried their dead in individual graves, often with the drinking vessel that gives their culture its name. The earliest of them still used flint; later groups, however, brought a knowledge of metallurgy and were responsible for the exploitation of gold and copper deposits in Britain and Ireland. They may also have introduced an Indo-European language. Trade was dominated by the chieftains of Wessex, whose rich graves testify to their success. Commerce was far-flung, in one direction to Ireland and Cornwall and in the other to central Europe and the Baltic, whence amber was imported. Amber bead spacers from Wessex have been found in the shaft graves at Mycenae in Greece. It was, perhaps, this prosperity that enabled the Wessex chieftains to construct the remarkable monument of shaped sarsens (large sandstones) known as Stonehenge III. Originally a late Neolithic henge, Stonehenge was uniquely transformed in Beaker times with a circle of large bluestone monoliths transported from southwest Wales.

Little is known in detail of the early and middle Bronze Age. Because of present ignorance of domestic sites, these periods are mainly defined by technological advances and changes in tools or weapons. In general, the southeast of Britain continued in close contact with the continent and the north and west with Ireland.

From about 1200 bc there is clearer evidence for agriculture in the south; the farms consisted of circular huts in groups with small oblong fields and stock enclosures. This type of farm became standard in Britain down to and into the Roman period. From the 8th century onward, British communities developed close contacts with their continental European neighbours. Some of the earliest hill forts in Britain were constructed in this period (e.g., Beacon Hill, near Ivinghoe, Buckinghamshire; or Finavon, Angus); though formally belonging to the late Bronze Age, they usher in the succeeding period.

Iron Age

Knowledge of iron, introduced in the 7th century, was a merely incidental fact: it does not signify a change of population. The centuries 700–400 bc saw continued development of contact with continental Europe. Yet the greater availability of iron facilitated land clearance and thus the growth of population. The earliest ironsmiths made daggers of the Hallstatt type but of a distinctively British form. The settlements were also of a distinctively British type, with the traditional round house, the “Celtic” system of farming with its small fields, and storage pits for grain.

The century following 600 bc saw the building of many large hill forts; these suggest the existence of powerful chieftains and the growth of strife as increasing population created pressures on the land. By 300 bc swords were making their appearance once more in place of daggers. Finally, beginning in the 3rd century, a British form of La Tène Celtic art was developed to decorate warlike equipment such as scabbards, shields, and helmets, and eventually also bronze mirrors and even domestic pottery. During the 2nd century the export of Cornish tin, noted before 300 by Pytheas of Massalia, a Greek explorer, continued; evidence of its destination is provided by the Paul (Cornwall) hoard of north Italian silver coins. In the 1st century bc this trade was in the hands of the Veneti of Brittany; their conquest (56 bc) by Julius Caesar, who destroyed their fleet, seems to have put an end to it.