In what year did Henry I of Castile's grandather sign a peace treaty guaranteeing his successorship to the throne of England?
Henry II of England:  He inherited Anjou in 1151 and shortly afterwards married Eleanor of Aquitaine, whose marriage to Louis VII of France had recently been annulled. Henry II of England:  Stephen agreed to a peace treaty after Henry's military expedition to England in 1153, and Henry inherited the kingdom on Stephen's death a year later.
i don't know