What is "aun"

Aun the Old (Aun inn gamli, latinized Auchun, English: "Edwin the Old") mythical Swedish king of the House of Yngling in the Heimskringla. Aun was the son of Jorund, and had ten sons, nine of which he was said to have sacrificed in order to prolong his own life. Based on the internal chronology of the House of Yngling, Aun would have died late in the 5th century. He was succeeded by his son Egil Vendelcrow ( Íslendingabók: Egill Vendilkráka) identified with Ongentheow of the Beowulf narrative and placed in the early 6th century.