That he later on ruled together with his brother Inge has some support from a
papal letter from 1081, by
Pope Gregory VII, which refers to two kings with the initials
A and
I, and where they are called kings of
Västergötland). However, the king "A" could also be
Håkan the Red. His co-rulership with his brother Inge is also mentioned in the
Hervarar saga. In the regnal list of the
Westrogothic law, he is said to have been courteous and cheerful, and whenever a case was submitted to him, he judged fairly, and this was why Sweden mourned his death. He was the father of the co-rulers
Philip and
Inge the Younger. The
Hervarar saga, which is one of the few sources about the kings of this time, has the following to tell: ==Notes and references==