Columbia subject headings:
Harvard subject headings:
Islamic law--History--Early works to 1800.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644--Knowledge--Islamic law.
Princeton subject headings:
Islamic law--History--Early works to 1800.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644--Contributions in Islamic law.
ʻUmar ibn al-Khaṭṭāb, Caliph, -644--Knowledge--Islamic law.