Cunobeline 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" 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, Kymbelinus or Cymbeline, as in the play by William Shakespeare.