إمارة أنطاكية
Jerusalem's northern border was of great concern. Fulk had been appointed regent of the Principality of Antioch by Baldwin II. As regent he had Raymond of Poitou marry the infant Princess Constance of Antioch, his and Melisende's niece. However, the greatest concern during Fulk's reign was the rise of Zengi, atabeg of Mosul.