Assertion: caliph | /r/HasProperty | umar
Facets:
Source sentences:
text: The use of this title continued with Abu Bakr's own successors, the caliphs Umar, Uthman and Ali, all of whom were non-hereditary.
text: The two groups also disagree on Ali's attitude towards Abu Bakr, and the two caliphs who succeeded him: Umar and Uthman Ibn Affan.