Ambrosius Aurelianus
Several historical figures have been proposed as the basis for Arthur, ranging from Lucius Artorius Castus, a Roman officer who served in Britain in the 2nd or 3rd century, to sub-Roman British rulers such as Riotamus, Ambrosius Aurelianus, Owain Ddantgwyn, and Athrwys ap Meurig. However, no convincing evidence for these identifications has emerged.