Besides pulling the sword from the stone what else makes arthur the rightful heir to the crown?

In Arthurian legend, Arthur is often seen as the rightful heir due to his lineage, being the son of Uther Pendragon and Igraine. Additionally, his qualities of leadership, chivalry, and wisdom displayed throughout his life also contribute to his claim to the throne. Finally, his successful leadership in battle and ability to unite the realm under his rule further solidify his position as the rightful king.