, Abū Saʿīd , S̲h̲ihāb al-Dawla , D̲j̲amāl al-Milla , etc., sultan of the G̲h̲aznawid [q.v.] dynasty, reigned 421-32/1030-40.
The eldest son of the great Maḥmūd b. Sebüktigin [q.v.], he was born in 388/998. In 406/1015-16, as walī ʿahd or heir apparent, he was made governor of Harāt and in 411/1020 led an expedition into the still-pagan enclave of G̲h̲ūr [q.v.] in central Afg̲h̲ānistān. When in 420/1029 Maḥmūd annexed the northern Būyid amirate of Ray and D̲j̲ibāl and attacked the Kākūyids [q.v.] of Iṣfahān and Hamad̲h̲ān. Masʿūd was placed in charge of these operations in western Persia.
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