Addedomaros was a king of the tribe of Trinovantes, whose territory comprised parts of Essex and Suffolk, with its capital at Camulodunum, now known as Colchester. As a ruler, Addedomaros is completely unknown to history and thus only exists through his coins. Julius Caesar mentions that the Trinovantes were enemies of the Catuvellauni, their tribal areas being adjacent. He also comments that they supplied him with provisions during his second landing in Britain in 54 BC, thirty-nine years before the time of Addedomaros.