Isaac II Angelus made a secret treaty to impede the attacking side of this conflict, which William II was the first to join. Anglo-French relations during this conflict improved at Vezelay after succession disputes between King Guy and Conrad of Montferrat, who was killed by the Nizari Ismāiliyyah. One of its leader was succeeded by his son Henry VI after drowning in the Saleph River. Duke Leopold V and King Philip II returned home after the siege of Acre during this conflict that saw the death of Frederick Barbarossa. For 10 points, name this campaign, ended by the Treaty of Jaffa, where Richard the Lionheart led English troops against his Muslim rival Saladin but did not retake Jerusalem. 
Isaac II Angelus made a secret treaty to impede the attacking side of this conflict, which William II was the first to join. Anglo-French relations during this conflict improved at Vezelay after succession disputes between King Guy and Conrad of Montferrat, who was killed by the Nizari Ismāiliyyah. One of its leader was succeeded by his son Henry VI after drowning in the Saleph River. Duke Leopold V and King Philip II returned home after the siege of Acre during this conflict that saw the death of Frederick Barbarossa. For 10 points, name this campaign, ended by the Treaty of Jaffa, where Richard the Lionheart led English troops against his Muslim rival Saladin but did not retake Jerusalem. 
Isaac II Angelus made a secret treaty to impede the attacking side of this conflict, which William II was the first to join.
Third Crusade [prompt on the Crusades]