Lewis Short
Brĭgantes (noun M) : (acc. Brigantas, Tac. A. 12, 32)
* The most northern and powerful people in Roman Britain, subdued by Cerialis, Tac. A. 12, 32; id. H. 3, 45; id. Agr. 17; Juv. 14, 196.—Hence, Julius Briganticus, a son of the sister of Civilis, Tac. H. 4, 70; 2, 22; 5, 21.
Charlton T. Lewis, Charles Short, A Latin Dictionary