Maggur Rathhausak is a Scanran warlord from southern Scanra, who united various tribes of the nation in the Scanran War. He enlisted the help of Blayce the Gallan, to whom he bequeathed his former fief and who produced killing devices for him. Those devices were instrumental in his war against Tortall.
Maggur learned warfare in unspecified foreign lands, where he picked up skills that helped him become a very effective commander. After returning to Scanra, he retrieved his mother and aunt from this fief and left it abandoned, until giving it to Blayce.
He never appeared in any of the novels personally, but has been mentioned repeatedly in the Protector of the Small quartet, where he was Tortall's enemy in the later volumes.