The celts were a group of tribal societies in iron age and medieval europe they settled in britain in around 500 bc and flourished until the romans invaded in 55 bc the most famous celtic queen was boudicca queen of the iceni tribe she attacked london in ad 60 but was eventually defeated in battle the celtic dagger features and anthropomorphic hilt the human form must have been intended to enhance the power of the owner and to bear a talismanic significance the british museum has some exc