Taking command of the British forces on the death of his brother Guiderius, Arvirgu semerged victor from a major skirmish with Claudius' troops. He eventually ruled the British as Rome's puppet-king, being interred in the city of Gloucester. British warriors at that time were famed for their ability to fight whilst standing on the pole of the chariot, and Arviragus was particularly adept at this as a certain Roman author testified: "Either you will catch a certain king, or else Arviragus will tumble from the British chariot-pole." Cassivelaunus. It was this king who withstood, in the year 55 BC, the invading armies of Julius Caesar. Arviragus was starved into submission after betrayal by Androgeus, his brother Lud's eldest son. The British resistance, however, had been great and fierce, evoking from the Roman author Lucan much praise concerning one particular engagement : Territa quaesitis ostendit terga Britannis, when Caesar fled in terror from the very Britons whom he'd come to attack!".The leader of the resistance to Caesar in both of his British campaigns. Cassivellaunus possibly formed the tribe later to become known as the Catuvellauni from a federation of smaller like-minded Belgic tribes living north of the Thames, specifically to counter Caesar.
The next identifiable ruler of the Catuvellauni was Tasciovanus who came to power, though wh ether he was the son or grandson of Cassivellaunus is not known. [It is possible that Cassivellaunus should be translated as 'Vellaunus of the Cassi', i.e. his tribe was the Cassi and his name was Vellaunus. It follows that the name given to the amalgamated tribe gathered under his command could mean 'the Followers1 or Smiters2 of Vellaunus'. 1 Latin caterva crowd, troop, company, flock. 2 Gaelic cath to smite.]
Author: Bill Cooper Title: After the Flood, Appendix 13 Britain's First Christian
Author: Bill Cooper Title: The Table of Nations

King of the Silures In a classical poem by Juvenal he is called the Black Bull. This probabl y refered to his strength and his black hair. The Welsch believe he was the King of Silures and lead forces against the Romans. He captured and taken to Rome where he was pardoned. Tradition says he returned to Wales and established the royal line from with the legendary King Arthur was descended. It is claimed that he was the King who welcomed Joseph of Arimathea to Britian in 63 b.c. and granted him land at Flastonbury for his church. Geoffrey of Monmouth, an ancient historian, who paid tribute to Roman and married Claudius' daughter.
http://www.gencircles.com/users/nannyelc/1/data/12473
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{John S. Wurts, "Magna Charta," p. 2795: "...Arviragus, a Druid king, eleventh son of Cymbeline. Shakespeare tells
of the kidnapping by Belarius of Cymbeline and his brother Guiderius."}