Caratacus was a first century British

British Iron Age

The British Iron Age is a conventional name used in the archaeology of Great Britain, referring to the prehistoric and protohistoric phases of the Iron-Age culture of the main island and the smaller islands, typically excluding prehistoric Ireland, and which had an independent Iron Age culture of...

 chieftain of the Catuvellauni

Catuvellauni

The Catuvellauni were a tribe or state of south-eastern Britain before the Roman conquest.The fortunes of the Catuvellauni and their kings before the conquest can be traced through numismatic evidence and scattered references in classical histories. They are mentioned by Dio Cassius, who implies...

 tribe, who led the British resistance to the Roman conquest.

Before the Roman invasion Caratacus participated in battles which expanded the territory of his tribe. His success only led to Roman invasion, nominally in support of his defeated enemies. Resisting the Romans, he mixed guerrilla warfare with set-piece battles, but was unsuccessful in the latter.