Gallus, A. Di'dius
was curator aquarum
in the reign of Caligula, A. D. 40.
In the reign of Claudius, A. D. 50, he commanded a Roman army in Bosporus, and subsequently he was appointed by the same emperor to succeed Ostonus in Britain, where, however, he confined himself to protecting what the Romans had gained before, for he was then at an advanced age, and governed his province through his legates.
In his earlier years he seems to have been a man of great ambition, and of some eminence as an orator. (Frontin. de Aquaed.
102; Tac. Ann. 12.15
14 ; Quint. Inst. 6.3.68