Alp Arslan (honorific in Turkish meaning "Heroic Lion"; in Persian: ??? ???????; full name: Diya ad-Dunya wa ad-Din Adud ad-Dawlah Abu Shuja’ Muhammad Alp Arslan ibn Dawud ???? ?????? ? ????? ??? ?????? ??? ???? ???? ??? ?????? ??? ????;? 20 January 1029 – 15 December 1072), real name Muhammad bin Dawud Chaghri, was the second Sultan of the Seljuk Empire and great-grandson of Seljuk, the eponymous founder of the dynasty.
As Sultan, Alp Arslan greatly expanded Seljuk territory and consolidated power, defeating rivals to his south and northwest.
His victory over the Byzantines at the Battle of Manzikert in 1071 ushered in the Turkish settlement of Anatolia.
For his military prowess and fighting skills he obtained the name Alp Arslan, which means "Heroic Lion" in Turkish.