Duchess of Sweden
*Ingeborg , Princess of Sweden , Duchess of Sweden 1248–1254 , it is unknown whether this was a primary title in its own right or adopted as consort of Birger Jarl 
<triplet> Ingeborg, Princess of Sweden <subj> Birger Jarl <obj> spouse <triplet> Birger Jarl <subj> Ingeborg, Princess of Sweden <obj> spouse