Context : Rikissa Birgersdotter was born as one of the eldest children in the marriage of lord Birger Magnusson of Bjelbo, later riksjarl and regent of Sweden, and Princess Ingeborg Eriksdotter of Sweden, eldest sibling of king Eric XI of Sweden. 
Subject : Rikissa Birgersdotter 
Relation : date of death
What year did Rikissa Birgersdotter die?