Detailed Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Problem:Context : Matilda of Holstein or Mechthild (1220 or 1225 -- 1288 in Kiel) was a Danish queen consort, married to King Abel of Denmark and later to Birger Jarl, Regent of Sweden.
Answer : Abel of Denmark
Solution:
What is Matilda of Holstein's spouse's name?