Catherine Birgersdotter of Bjelbo Princess consort of Anhalt (1250–1289) Parents Ingeborg Eriksdotter of Sweden Birger Jarl Children Albert I, Prince of Anhalt-Zerbst Siblings Valdemar Eric Birgersson Rikissa Birgersdotter Ingeborg Birgersdotter of Bjelbo Magnus III of Sweden Benedict, Duke of Finland Gregers Birgersson Kristina Birgersdotter Partners Siegfried I, Prince of Anhalt-Zerbst