Assertion: later caliph | /r/HasProperty | umar ii
Facets:
Source sentences:
text: He is sometimes referred to as Caliph 'Umar I by historians of Islam, since a later Umayyad caliph, 'Umar II, also bore that name.
text: He is sometimes referred to as Umar I by historians of Islam, since a later Umayyad caliph, Umar II, also bore that name.