Assertion: second caliph | /r/HasProperty | umar ibn al-khattab
Facets:
Source sentences:
text: He was succeeded by the second Caliph, Umar ibn al-Khattab, who ruled until 644.
text: The Second Caliph, Umar ibn al-Khattab, was appointed by Abu Bakr on his death, followed by the third Caliph, Uthman ibn 'Affan, who was chosen from six candidates nominated by Umar.