At some time between 109 AD and 122 AD the garrison of the Ninth Legion was replaced by the Sixth Legion. There is no documented trace of the Ninth Legion after 117 AD, and various theories have been proposed as to what happened to it. The Sixth Legion remained in York until the end of Roman occupation about 400 AD. The Emperors Hadrian, Septimius Severus and Constantius I all held court in York during their various campaigns. During his stay, the Emperor Severus proclaimed York capital of the province of Britannia Inferior, and it is likely that it was he who granted York the privileges of a colonia or city. Constantius I died during his stay in York, and his son Constantine the Great was proclaimed Emperor by the troops based in the fortress.