Ridda wars
Khalid ibn al-Walid ibn al-Mughira al-Makhzumi (; died 642) was an Arab Muslim commander in the service of the Islamic prophet Muhammad and the caliphs Abu Bakr () and Umar () who played a leading role in the Ridda wars against rebel tribes in Arabia in 632–633 and the early Muslim conquests of Sasanian Iraq in 633–634 and Byzantine Syria in 634–638.