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While Berkyaruk was occupied with his rivals in the
struggles for sultanate in the west, another member of the same dynasty called asArslan
Argun who was his uncle had declared his independency in the east of the state, and had
expanded his infuential regions upon the captures of the cities such as Merv, Tirmiz and
Nisabur. When Berkyaruk got rid of his rivals in the west, he decided to annihilate Arslan
Argun. To this effect, he sent his other uncle, Bori-Bas towards him. Although Bori-Bas
had achieved success in the beginning, he lost the war that occurred within the environs
of Herat. After a while, Arslan Argun had Böri-Bas be strangled (1095).
Berkyaruk appointed
his brother, Sencer as the "ruler" of Khorasan. In the same year, Mohammed b.
Cagri who born the title of "Emir-i emiran" (Emir of emirs) from the same Seljuk
dynasty rebelled by means of the probable support of the Gazneli State, but he was
defeated by Sencer. Karahanli State repeated their submission to Berkyaruk. Berkyaruk had
played role in the enthronement of three rulers to the throne of the Western Karahanli
State. He appointed his brother, Mohammed Tapar with the task of the government of Gence
and its environs.
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