Question: The medieval fortification Castle Hill was builty by this noble man who was also known as King of which country (after the 1250s)?
Sentence (from "Richard, 1st Earl of Cornwall"): He was one of the wealthiest men in Europe and joined the Barons' Crusade, where he achieved success as a negotiator for the release of prisoners and assisted with the building of the citadel in Ascalon.
Relevant evidence: No