Columbia subject headings:
Islamic Empire--Biography.
Khālid ibn al-Walīd, -641 or 642.
Harvard subject headings:
Islamic Empire--Biography.
Khālid ibn al-Walīd, -641 or 642.
Princeton subject headings:
Generals--Islamic Empire--Biography.
Khālid ibn al-Walīd, -641 or 642.
Muḥammad, Prophet, -632--Friends and associates--Biography.