Some of the known Celtic tribes in Britain and Ireland were as follows:

• The Brigantes were an important tribe in northern England.
• The Caledonians inhabited present-day Scotland.
• The Belgae settled various places in eastern and southern England.
• The Dobunni lived in the Cotswolds and the Severn valley.
• The Dumnonii occupied what are now Devon, Cornwall and Somerset.
• The Durotriges inhabited Dorset and south Wiltshire.
• The Iceni, who under Boudicca rebelled against the Roman rule of ancient East Anglia.
• The Ordovices who waged guerrilla warfare from the north Wales hills.
• The Parisii settled east Yorkshire and Humberside.
• The Scotti lived in northern Ireland and settled the western portion of Scotland which then became known as the Dalriada.
• The Silures likewise resisted the Romans in present-day south Wales.
• The Trinovantes and the Catuvellauni were tribes neighbouring the Iceni, and who joined in their rebellion.