Siggy Haraldson is the dutiful wife of Earl Haraldson, the Viking chieftan. Although she appears loyal to him, she is primarily concerned with protecting her daughter Thyri, who is nearing marrying age. Siggy understands that Ragnar might make a play for her husband's position and seems to have an understanding of the politics in play and an ability to ensure that she comes out on top, even if Haraldson doesn't.She forms an alliance with Ragnar's brother Rollo, to the benefit of them both.