- Caliphs--Biography (2)
- History, Modern--20th century (2)
- ʿUmar II, Caliph, d. 720 (2)
- Europe--History--20th century (1)
- Islamic Empire--History (1)
- Umar II, Caliph, d. 720 (1)
- World War, 1914-1918--Europe (1)
- World War, 1939-1945--Europe (1)
- ʻUmar II, Caliph, d. 720 (1)
- ʿUmar ibn ʿAbd al-ʿAzīz, Caliph, d.720--Fiction (1)