Columbia subject headings:
Harvard subject headings:
Caliphs--Islamic Empire--Biography--Early works to 1800.
Islamic Empire--History--622-661--Early works to 1800.
Islamic Empire--Kings and rulers--Early works to 1800.
Muḥammad, Prophet, -632--Companions--Biography--Early works to 1800.
Muslims--Saudi Arabia--Biography--Early works to 1800.
Princeton subject headings:
Muslims--Saudi Arabia--Biography--Early works to 1800.