Cunobeline (or Cunobelin, from Latin Cunobelinus, derived from Greek Kynobellinus, Κυνοβελλίνος) was a king in pre-Roman Britain from the late first century BC until the 40s AD. He is mentioned in passing by the classical historians Suetonius and Dio Cassius, and many coins bearing his inscription have been found. He appears to have controlled a substantial portion of south-eastern Britain, and is called "King of the Britons" (Britannorum rex) by Suetonius.
Cunobeline appears in British legend as Cynfelyn (Welsh), Kymbelinus (medieval Latin) or Cymbeline, as in the play by William Shakespeare. His name is a compound made up of cuno- (hound) and Belenos (the god Belenus).
From numismatic evidence Cunobelinus appears to have taken power around 9 AD, minting coins from both Camulodunum (Colchester, capital of the Trinovantes) and Verlamion (later the Roman town of Verulamium, now modern St Albans), capital of the Catuvellauni. Some of the Verulamium coins name him as the son of Tasciovanus, a previous king of the Catuvellauni; unlike his father's, his coins name no co-rulers. However his earliest issues are from Camulodunum, indicating that he took power there first, and some have a palm or laurel wreath design, a motif borrowed from the Romans indicating a military victory. He may have been emboldened to act against the Trinovantes by the Roman defeat in the Battle of the Teutoburg Forest in Germania in AD 9. The Trinovantes were a Roman ally whose independence was protected by a treaty made by Julius Caesar in 54 BC, but problems in Germania severely discouraged Augustus's territorial ambitions and ability to defend allies in Britain.