Begtoghdi (بگتغدی; meaning “a prince has been born, has arisen”), also known by the Persianized form as Baktoghdi (بکتغدی), was a Turkic slave commander who served under the early Ghaznavid rulers, but later fell out of favor and was executed.
Mas'ud, however, considered the nomadic Turks a dangerous threat and sent an army under Begtoghdi, who fought them near Nasa, but was defeated.
However, another Ghaznavid officer named Sahib Husain Mikali, continued to fight, but was also defeated and was captured by Tughril's brother Chaghri Beg.
Mas'ud was then forced to cede Nasa, Farava and Dihistan to the Seljuq in return for their recognition of Ghaznavid authority.
Begtoghdi, along with his comrades Ali Daya and Subashi, are later mentioned as participating at the Battle of Dandanaqan, which resulted in a disastrous Ghaznavid defeat, and gave the Seljuqs the opportunity to conquer all of western Khorasan.