In the Arthurian legend, it is almost always his illegitimate father Uther who was king before him. In most legends, Aeuralius Ambrosius was king before Uther, and before him it was Vortigern.
King Arthur released Excalibur sword from stone what was proof he can be the only right king. Arthur also bring a justice and peace into his land. He was much better king than the previous one...his...