In [[490]], Octa and Eosa both waged war against [[King Uther Pendragon]], having successfully beaten [[King Heraut|King Heraut of Malahaut]]. The pair wished to steal Excalibur for themselves, as Octa believed his cousin Eosa deserved a magical weapon as well. The pair were defeated, their army routed, and Eosa was himself struck down by [[Duke Ulfius of Silchester]].
In [[493]], Eosa escaped the dungeons of Logres with his cousin, King Octa. The pair reached Malahaut, where they forged an alliance with [[King Heraut]] to attack Logres, hoping to wage war against the ill King Uther. The plot was discovered by the Ursine Brotherhood, who successfully warned the King of the alliance.