The Trinovantes and the Catuvellauni were the neighbouring tribe of the Iceni, and who joined in their rebellion.
The Ordovices who waged guerrilla warfare from the North Wales hills.
The Silures likewise resisted the Romans in present-day South Wales.
The Brigantes were an important tribe in Northern England.
The Dobunni lived in the Cotswalds and the Severn valley.
The Caledonians inhabited present-day Scotland.