Q: 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.
Context : Catherine of Lancaster (Castilian: Catalina; 31 March 1373 -- 2 June 1418) was Queen of Castile as the wife of King Henry III of Castile.
Answer : Henry III of Castile
A:
What is Catherine of Lancaster's spouse's name?