Columbia subject headings:
Crusades.
Harvard subject headings:
Crusades--History.
Nūr al-Dīn, Atabeg of Syria, 1118-1174.
Syria--History--750-1260.
Princeton subject headings:
Crusades--History.
Nūr al-Dīn, Atabeg of Syria, 1118-1174.
Syria--History--750-1260.