Question: In what year did Henry I of Castile's grandather sign a peace treaty guaranteeing his successorship to the throne of England?
Sentence (from "Henry II of England"): Henry II (5 March 1133 – 6 July 1189), also known as Henry Curtmantle (French: "Court-manteau" ), Henry FitzEmpress or Henry Plantagenet, ruled as Count of Anjou, Count of Maine, Duke of Normandy, Duke of Aquitaine, Count of Nantes, King of England and Lord of Ireland; at various times, he also controlled Wales, Scotland and Brittany.
Relevant evidence: No