The Sarmatian Hypothesis proposes that the original, historical Arthur was a Roman military leader named Lucius Artorius Castus, who commanded of a group of Sarmatian warriors for two years in Britain, around 182. Castus probably led this group in battle several times, though he left Britain for other commands and eventually died in Dalmatia. The theory proposes that the Sarmatians in Britain continued to live there, possibly employed by the Roman military, possibly maintaining their nomadic ways and their own language, but at any rate telling their traditional stories with a new hero, Castus, called by them Artorius.