Sauros Boreas Greyrat サウロス・ボレアス・グレイラット
Sauros Boreas Greyrat was the Landlord of the Fittoa Region, Asura Kingdom and the grandfather of Eris.
SpoilerAfter the Teleport Incident, he was blamed for the loss of the Fittoa Region and was executed.
(Source: Mushoku Tensei Wiki)