The Iceni were centered in Norfolk, but also occupied parts of Suffolk and Cambridgeshire after the revolt under Boudicca. Their capital was Venta Icenorvm, a small walled town, disadvantaged by not being sited on a river, and located in Caister St. Edmund, Norfolk. The Iceni operated a monarchic society, and their territory was separated from the Coritani tribal lands in the west by uninhabited fenland. Coin legends were introduced around the beginning of the millennia. The continuation of the coinage after the invasion by Rome is attested by the coins of King Prasutagus.

Celtic Coin Book References:

S = Coins of England and the United Kingdom
M = R P Mack, The Coinage of Ancient Britain
VA = R D Van Arsdell, Celtic Coinage in Britain
BMC = D Allen & R Hobbs, British Museum Catalogues
GEB = J Sills, Gaulish and Early British Gold Coinage
LT = S Gouet, M Prieur & L Schmitt, La Tour
CCI = Celtic Coin Index at Oxford University
WW = Wildwinds.com (reference & attribution site)