Khalid ibn al-Walid ibn al-Mughira al-Makhzumi (Arabic: خالد بن الوليد بن المغيرة المخزومي, romanized: Khālid ibn al-Walīd ibn al-Mughīra al-Makhzūmī; died 642) was a 7th-century Arab military commander. He initially headed campaigns against Muhammad on behalf of the Quraysh. He later became a Muslim and spent the remainder of his career in service to Muhammad and the first two Rashidun successors: Abu Bakr and Umar. Following the establishment of the Rashidun Caliphate, Khalid held a senior command in the Rashidun army; he played the leading role in the Ridda Wars against rebel tribes in Arabia in 632–633, the initial campaigns in Sasanian Iraq in 633–634, and the conquest of Byzantine Syria in 634–638.
As a horseman of the Quraysh’s aristocratic Banu Makhzum, which ardently opposed Muhammad, Khalid played an instrumental role in defeating Muhammad and his followers during the Battle of Uhud in 625. In 627 or 629, he converted to Islam in the presence of Muhammad, who inducted him as an official military commander among the Muslims and gave him the title of Sayf Allah (lit. ’Sword of God’). During the Battle of Mu’ta, Khalid coordinated the safe withdrawal of Muslim troops against the Byzantines. He also led the Bedouins under the Muslim army during the Muslim conquest of Mecca in 629–630 and the Battle of Hunayn in 630. After Muhammad’s death, Khalid was appointed to Najd and al-Yamama with the purpose of suppressing or subjugating Arab tribes who were opposed to the Rashidun Caliphate; this campaign culminated in Khalid’s victory over Arab rebel leaders Tulayha and Musaylima at the Battle of Buzakha in 632 and the Battle of Yamama in 633, respectively.
Khalid subsequently moved against the largely Christian Arab tribes and the Sasanian Persian garrisons of the Euphrates valley in Iraq. He was reassigned by Abu Bakr to command the Muslim armies in Syria and he led his men there on an unconventional march across a long, waterless stretch of the Syrian Desert, boosting his reputation as a military strategist. As a result of decisive victories led by Khalid against the Byzantines at Ajnadayn (634), Fahl (634 or 635), Damascus (634–635), and the Yarmouk (636)
