 The Romans could not accept a formerly pro-Roman tribe the size of the Brigantes now being ant-Roman, so the Roman conquest of the Brigantes began two years later.Tacitus gives pride of place in the conquest of the north to Agricola (his father-in-law), who was later governor of Britain during 77–83 AD.However, it is thought that much had been achieved under the previous governorships of Vettius Bolanus (governor 69–71 AD), and of Quintus Petillius Cerialis (governor 71–74 AD).