Question: Who is the paternal grandfather of Knut Birgersson, Riksjarl Of Sweden?
Sentence (from "Knut Birgersson, Riksjarl of Sweden"): This was despite the fact that Sverker had named his infant son Johan Sverkersson as riksjarl following the death of Jarl Birger Brosa, in an attempt to confirm Johan as his royal successor and to diminish the power of highest nobility by effectively abolishing the position of riksjarl, so no adult noble could occupy it.
Relevant evidence: No