Between 1359 and 1361 Cardinal Guy was in Spain on another lengthy legation. The son of King Jayme II of the Kingdom of Majorca, Jayme III, had been captured in battle on 25 Ootober 1349, and spent the next thirteen years as "The Man in the Iron Cage". Pope Innocent VI had made numerous demands for his release, and this was one of the purposes of Cardinal Guy's legation. The status of the Kingdom itself was a matter of contention. And there were the disputes with King Pedro of Castile and Pedro IV of Aragon, in what came to be called the War of the Two Peters. In May 1361 Cardinal Guy de Boulogne was able to get the two monarchs to sign a peace treaty. He returned to Avignon on 8 November 1361. The treaty had no effect.