Abū Sulaymān Khālid ibn al-Walīd ibn al-Mughīrah al-Makhzūmī (; 585 –642) also known as
Sayf Allāh al-Maslūl (;
Drawn Sword of God), was a
companion of the
prophet Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina under Muhammad and the forces of his immediate successors of the
Rashidun Caliphate,
Abu Bakr and
Umar ibn Khattab. It was under his military leadership that
Arabia, for the first time in history, was united under a single political entity, the
Caliphate. Commanding the forces of the nascent Islamic State, Khalid was victorious in over a hundred battles, against the forces of the
Byzantine-Roman Empire,
Sassanid-Persian Empire, and their allies, in addition to other Arab tribes. His strategic achievements include the conquest of
Arabia during the
Ridda Wars,
Persian Mesopotamia and
Roman Syria within several years from 632 to 636. He is also remembered for his decisive victories at
Yamamah,
Ullais, and
Firaz, and his tactical successes at
Walaja and
Yarmouk.