Columbia subject headings:
Harvard subject headings:
Africa, North--Foreign relations--Europe.
Africa, North--History--647-1517.
Christianity and other religions--Islam
Crusades--13th-15th centuries
Europe--Foreign relations--Africa, North.
Mahdīyah (Tunisia)--History--14th century.
Western Mediterranean--History.
Princeton subject headings:
Africa, North--Foreign relations--Europe.
Africa, North--History--647-1517.
Christianity and other religions--Islam.
Crusades--13th-15th centuries.
Europe--Foreign relations--Africa, North.
Genoa (Italy)--History--1339-1528.
Mahdīyah (Tunisia)--History--14th century.
Western Mediterranean--History.