Excerpts from Books and Wikipedia
After 43, the Romans ruled in Britain for almost 400 years. Emperor Claudius was in Britain for 16 days and celebrated a triumph upon returning to Rome. Seven tribes surrendered to Roman rule at Camulodunum (modern Colchester). Some tribes had already paid tribute to Rome. This Roman invasion was prompted by a war between two British tribes. [Furtado: 1001 Days]