During the reign of Caliph Umar ibn al-Khattab (634–644 CE), Muslim forces fought the Sassanid Empire in the region that is now Iran. These battles, including the Battle of Qadisiyyah (636 CE), were part of the Muslim conquest of Persia, leading to the eventual fall of the Sassanid Empire and expansion of Islam into Iran.
During the Khilafat of Umar ibn al-Khattab, who did the Muslims fight in present-day Iran?
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