Very little is known of Chaghri and Tughril's lives until 1025. Both were raised by their grandfather Seljuk until they were fifteen and fought with
Ali Tigin Bughra Khan, a minor Kara Khanid noble, against
Mahmud of Ghazni. The earliest records of Chaghri concern his expeditions in
Eastern Anatolia. Although a
Ghaznavid governor chased him from his home in Jend to Anatolia, he was able to raid the
Byzantine forts in Eastern Anatolia. However, according to
Claude Cahen this was highly improbable and of legend. From 1035 to 1037 Chaghri and Tughril fought against
Mas'ud I of Ghazni. Chaghri captured
Merv (an important historical city now in
Turkmenistan). Between 1038 and 1040 Chaghri fought against the Ghaznavids, usually with hit and run maneuvers and culminating in a major clash at the
Battle of Dandanaqan. Tughril was rather hesitant and preferred continuing the hit-and-run attacks, but Chaghri commanded the Seljuk army and preferred direct confrontation. At Dandanaqan, the Seljuks defeated the numerically superior Gaznavid army. A
kurultai was held after the battle, by which empire was divided between the two brothers. While Tughril reigned in the west (comprising modern western
Iran,
Azerbaijan and
Iraq), Chaghri reigned in eastern
Iran,
Turkmenistan, and
Afghanistan, a region collectively referred to as
Greater Khorasan. Chaghri later also captured
Balkh (in modern North Afghanistan). In 1048, he conquered
Kerman in South Iran and, in 1056, the
Sistan region (south east Iran). After the
Seljuks had gained more influence over the
Abbasid Caliphate, Chaghri married his daughter,
Khadija Arslan Khatun, to the caliph
Al-Qa'im in 1056. ==Death==