Sigurd was the first Emperor of Rivellon and father of protagonist in Divinity: Dragon Commander. Sigurd had been betrayed by Architect and next was killed by his own children, because they were possessed by DreamWalker Demon.
Because of Architect's discovery, he conquered the whole world with giant silver machines and set peace in Rivellon for 30 years, but as being talented warlord he also understood that it's a mighty ally and dangerous enemy as well. He was also friend of Maxos-who have been his councilor and helped him a lot during the war.
Shortly before his death he fell in love with Aurora, who was a mighty Dragon and then she gave birth to their half-dragon son, who will be known as future Dragon Commander and new Emperor of Rivellon.