The cause of Lucius Artorius Castus's death, a Roman military commander is unknown, whereas King Arthur died during the Battle of Camlann.
2nd century AD) was a Roman military commander. Death Unknown date and circumstances; probably died at an advanced age, potentially during his procuratorship of Liburnia (where he was buried). In Welsh literature, traditionally stated to have died during the Battle of Camlann (of unknown location in Britain); his burial site was unknown to medieval Welsh. 
