The Atrebates were a Belgic tribe of the Iron Age and the Roman period, originally dwelling in the Artois region.
Britain.south.peoples.Ptolemy
Stater of Tincomarus, king of the Atrebates.
The Catuvellauni were a Celtic tribe or state of southeastern Britain before the Roman conquest, attested by inscriptions into the 4th century.
Atrebates
…Hampshire, West Sussex and Berkshire, centred on the capital Calleva Atrebatum (modern Silchester). They were bordered to the north by the Dobunni and Catuvellauni; to the east by the Regni; and to the south by the Belgae. The settlement of the Atrebates in Britain was not a mass population movement. Archaeologist…
Catuvellauni, Tasciovanus, "Hidden Faces" gold stater. Obv: stylized crescents and wreaths with hidden faces. Rev: Celtic warrior on horse right, carrying carnyx.
Coin of Tasciovanus, king of the Catuvellauni.
Coins of Epaticcus, king of the Catuvellauni.