Chaghri Beg

Chaghri Beg shared the founding of the Seljuk Empire with his younger brother Tughril, and although he never sat in Baghdad, the entire later dynasty descended from him. A grandson of Seljuk through the short-lived Mikail, he grew up amid the clan's hard years between Transoxianan patrons, and as a young commander he is credited with a long-range reconnaissance raid toward Armenia and eastern Anatolia around 1016 to 1021 — an expedition later remembered as the first Seljuk glimpse of the lands their descendants would rule.

At Dandanaqan in 1040 he stood with Tughril in the victory over the Ghaznavids that delivered Khorasan, and in the division of conquests that followed, Chaghri took the east. Ruling from Merv, he held the empire's Ghaznavid frontier, repelling repeated attempts by Mas'ud's successors to recover the province, and eventually stabilizing the border along a peace that left the Ghaznavids confined to Ghazna and northern India. His administration of Khorasan, reliant on Persian viziers and existing fiscal machinery, set the pragmatic tone the dynasty would keep: Turkish military power resting on Iranian bureaucratic foundations.

Where Tughril remained childless, Chaghri was prolific, and his children knit the new empire together. His son Alp Arslan inherited his command in Khorasan and would succeed Tughril as sultan; another son, Qavurt, founded the Seljuk line of Kerman, which outlasted the senior branch; a daughter, Arslan Khatun, was married to the Abbasid caliph al-Qa'im in 1056, sealing the family's alliance with the caliphate. Chaghri died at Merv around 1060, shortly before his brother, after two decades as co-ruler of the east. Later chroniclers, writing under his descendants, honored him as the dynasty's patriarch in fact if not in title: the sultans who fought at Manzikert and ruled at Isfahan were all his line.