Cunobeline (or Cunobelin, from Latin Cunobelinus, derived from Common Brittonic *Cunobelinos "Strong as a Dog", "Strong Dog") was a king in pre-Roman Britain from about AD 9 until about AD 40. He is mentioned in passing by the classical historians Suetonius and Dio Cassius, and many coins bearing his inscription have been found. He controlled a substantial portion of south-eastern Britain, including the territories of the Catuvellauni and the Trinovantes, and is called "King of the Britons" (Britannorum rex) by Suetonius. He appears to have been recognized by Roman emperor Augustus as a client king, as testified by the use of the Latin title Rex on his coins. 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 composed of Common Brittonic *cuno- "dog" and *belino- "strong", meaning "Strong as a Dog", or "Strong Dog". From numismatic evidence, Cunobelinus appears to have taken power around AD 9 after the death of his father Tasciovanus, 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. Some of Tasciovanus' coins bear the title rigonos, a derivative of the Brittonic root *rīgo- meaning "king". Unlike his father's, Cunobelinus' coins name no co-rulers. His earliest issues are, however, 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. It is possible that, following the Roman defeat in the Battle of the Teutoburg Forest, in Germania in AD 9, he was emboldened to act against the Trinovantes. The Trinovantes were a Roman ally whose independence was protected by a treaty they made with Julius Caesar in 54 BC, but problems in Germania severely discouraged Augustus's territorial ambitions and ability to defend allies in Britain.