 They may have been one of the four tribes of Kent, represented in Caesar by references to the "four kings of that region" and in the archaeological record by distinct pottery assemblages.During Julius Caesar's second invasion of Britain in 54 BCE, following Caesar's military success and restoration of King Mandubracius to power over the Trinovantes, opposition to the Romans coalesced around the figure of Cassivellaunus which led to divided loyalties among the Britons, as Caesar records.Emissaries of five British tribes, including the Cassi (the others being the Ancalites, the Segontiaci, the Cenimagni and the Bibroci), arrived at the Roman camp to treat for peace, and agreed to reveal details of Cassivellaunus' stronghold.