In abt 25BC Addedomaros becomes king of the Trinovantes and moves his centre of government from the eastern headwaters of the river Lea to a new site on the east coast, known later as Camulodunum (Colchester).

Was the next identifiable ruler of the Trinovantes after Mandubracius in Caesar's time, though it is not known whether any others preceeded him. Almost immediately upon his succession to the throne sometime between 25 to 15BC, he moved his centre of government from Braughing on the eastern headwaters of the river Lea to a new site on the east coast which he named 'the fort of the war god Camulos', or Camulodunum. It is possible that he either warred with or was client to Tasciovanus, for around 15-10BC the Catuvellaunian monarch produced a coin issue with the mint mark CAMV[lodunum] . He reigned for about a decade or so before being succeeded by his son Dubnovellaunus c. 10-5BC. It is possible Mandubracius died intestate or leaving no heirs; the family of Addedomaros, possibly championed by his father, succeeded to the throne after a brief struggle between the remaining Trinovantian noble houses; the Catuvellaunian king Tasciovanus later claimed that he was the true heir to the thone (perhaps his mother was the daughter of Mandubracius) and went to war on that pretext; thanks primarily to the interest of Rome, Tasciovanus was forced to withdraw and Addedomaros resumed the throne.]

http://www.roman-britain.org/tribes/iceni.htm