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Diviciacus or Divitiacus was a king of the Belgic nation of the Suessiones in the early 1st century BC. Julius Caesar, writing in the mid-1st century BC, says that he had within living memory been the most powerful king in Gaul, ruling a large portion not only of Gallia Belgica, but also of Britain.
Since it is likely that Diviciacus spent at least a part of his life in Britain, he may be considered the earliest inhabitant of the British Isles whose name has come down from antiquity.