Columbia subject headings:
Christianity and other religions--Islam--History--To 1500.
Church history--7th century.
Church history--8th century.
Church history--9th century.
Islam--Relations--Christianity--History--To 1500.
Islamic Empire--History--661-750.
Islamic Empire--History--750-1258.
Syriac Christians--Intellectual life.
Syrian churches--Doctrines--History.
Syrian churches--Relations--Islam.
Harvard subject headings:
Islam--History
Islamic civilization
Syria--Church history.
Princeton subject headings:
Christianity and other religions--Islam--History--To 1500.
Church history--7th century.
Church history--8th century.
Church history--9th century.
Islam--Relations--Christianity--History--To 1500.
Islamic Empire--History--661-750.
Islamic Empire--History--750-1258.
Syriac Christians--Intellectual life.
Syrian churches--Doctrines--History.
Syrian churches--Relations--Islam.