Question: Who is Violant Of Hungary's father-in-law?
Sentence (from "James I of Aragon"): He renounced northward expansion and taking back the once Catalan territories in Occitania and vassal counties loyal to the County of Barcelona, lands that were lost by his father Peter II of Aragon in the Battle of Muret during the Albigensian Crusade and annexed by the Kingdom of France, and then decided to turn south.
Relevant evidence: Yes