Son of the Roman senator Severus.
The Britons wanted to give Bassianus the throne of Britain after the death of Severus in the second century AD. The Romans, however, favored Severus’s other son, Geta. Bassianus and Geta fought several battles with each other before Bassianus finally killed Geta and assumed the kingdom.
The Roman Carausius, however, convinced Bassianus’s men to turn on him, and Bassianus was killed by his own soldiers during a battle with Carausius. Carausius then assumed the kingdom.
Sources
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138
Roman de Brut | c. 1155