Columbia subject headings:
Charlemagne, Emperor, 742-814.
France--Foreign relations--Islamic countries.
Hārūn al-Rashīd, Caliph, approximately 763-809.
Islamic countries--Politics and government.
Harvard subject headings:
Charlemagne, Emperor, 742-814.
France--Foreign relations--Islamic countries.
Hārūn al-Rashīd, Caliph, approximately 763-809.
Islamic countries--Politics and government.
Princeton subject headings:
Charlemagne, Emperor, 742-814.
France--Foreign relations--Mohammedan countries.
Hārūn al-Rashīd, Caliph, approximately 763-809.
Islamic countries--Politics and government.