in Ancient Geography, a warlike tribe of Britain, inhabiting a part of the island nearly corresponding with the counties of Norfolk and Suffolk. The exact limits of their country are very difficult to settle, and as the point is one of some importance for rightly understanding the campaign of Ostorius, it has caused a good deal of controversy. The only way of escaping the difficulty is to believe that the Iceni occupied a considerably larger surface of country than is usually assigned to them, and extending their frontiers to the confines of Essex and Hertfordshire. The great event in the history of this tribe is their rebellion from the Roman yoke under their queen Boadicea. See BOADICEA.