Columbia subject headings:
Crusades--13th-15th centuries.
Islamic Empire--History.
Middle Ages.
Pilgrims and pilgrimages.
Harvard subject headings:
Crusades--13th-15th centuries
Islamic Empire--History.
Middle Ages.
Pilgrims and pilgrimages
Princeton subject headings:
Crusades--13th-15th centuries.
Islamic Empire--History.
Middle Ages.
Pilgrims and pilgrimages.