Why is King Arthur considered a heroic figure in morte d'arthur?

King Arthur is considered a heroic figure in "Morte d'Arthur" due to his embodiment of ideals such as bravery, honor, and chivalry. He unites the Knights of the Round Table under a code of ethics, promoting justice and equality among his followers. His leadership during battles, commitment to protect his kingdom, and pursuit of the Holy Grail further solidify his reputation as an archetypal hero. Ultimately, his tragic downfall underscores the complexities of heroism and the inevitable consequences of fate.