A brooch from Marham, Norfolk, is identifed as being a hybrid Colchester Derivative and its relationship with other Colchester Derivatives is discussed. An examination of the basic distribution of the parent of the Marham brooch, the Rearhook, shows that it is of Icenian origin. Discussion of other rare hybrids along with the dating of the parent reveals that, alone of British brooches, the Rearhook has what may be described as an abrupt cut-off date which can be equated with the suppression of the Iceni. Only one hybrid has any development, and that is the one to which the Marham brooch belongs. The fantail foot found on many Rearhooks also has a later history which is examined. The discussion focuses on the dating and distribution of what may be described as ultimate Rearhook derivatives. The early post-Boudiccan history of the Iceni is alluded to and a case presented for the probable deliberate plantation of Icenians at Castleford.