Assertion: caliph's army | /r/CapableOf | conquer mesopotamia
Facets:
value: under whom
type: OTHER
Source sentences:
text: I, in full ʿUmar ibn al-Khaṭtāb, (born c. 586, Mecca, Arabia [now in Saudi Arabia]—died November 3, 644, Medina, Arabia), the second Muslim caliph (from 634), under whom Arab armies conquered Mesopotamia and Syria and began the conquest of Iran and Egypt.