Columbia subject headings:
Byzantine Empire--Relations--Islamic Empire.
Islamic Empire--Relations--Byzantine Empire.
Harvard subject headings:
Byzantine Empire--Foreign relations--Islamic Empire.
Islamic Empire--Foreign relations--Byzantine Empire.
Islamic Empire--History, Military
Muḥammad, Prophet, -632--Biography.
Muḥammad, Prophet, -632--Campaigns.
Muḥammad, Prophet, -632--Military leadership.
Princeton subject headings:
Byzantine Empire--Relations--Islamic Empire.
Islamic Empire--Relations--Byzantine Empire.