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in Anatolia Artuqid dynasty Saltuqid dynasty in Azerbaijan Ahmadili dynasty Ildenizid dynasty in Egypt Tulunid dynasty Ikhshidid dynasty in Fars Salghurid dynasty in The Levant Burid dynasty Zengid dynasty in Yemen Rasulid dynasty Astride a major artery of commerce between Eastern Europe and Southwestern Asia, Khazaria became one of the foremost trading emporia of the medieval world, commanding the western marches of the Silk Road and playing a key commercial role as a crossroad between China, the Middle East and Kievan Rus'.
Khazaria long served as a buffer state between the Byzantine Empire and both the nomads of the northern steppes and the Umayyad Caliphate, after serving as Byzantium's proxy against the Sasanian Persian empire. Byzantium began to encourage the Alans to attack Khazaria and weaken its hold on Crimea and the Caucasus, while seeking to obtain an entente with the rising Rus' power to the north, which it aspired to convert to Christianity.
By 568, these Göktürks were probing for an alliance with Byzantium to attack Persia.
An internecine war broke out between the senior eastern Göktürks and the junior West Turkic Qağanate some decades later, when on the death of Taspar Qağan, a succession dispute led to a dynastic crisis between Taspar's chosen heir, the Apa Qağan, and the ruler appointed by the tribal high council, Āshǐnà Shètú (阿史那摄图), the Ishbara Qağan.
This theory still finds occasional support, but most scholars view it with scepticism.
In the fragmentary Tes and Terkhin inscriptions of the Uyğur empire (744–840) the form 'Qasar' is attested, though uncertainty remains whether this represents a personal or tribal name, gradually other hypotheses emerged.
According to Arabic sources, the lesser king was called îšâ and the greater king Khazar xâqân; the former managed and commanded the military, while the greater king's role was primarily sacral, less concerned with daily affairs.Louis Bazin derived it from Turkic qas- ("tyrannize, oppress, terrorize") on the basis of its phonetic similarity to the Uyğur tribal name, Qasar.The objections are that Uyğur Gesa/Qasar was not a tribal name but rather the surname of the chief of the Sikari tribe of the Toquz Oğuz, and that in Middle Chinese the ethnonym "Khazars", always prefaced with the word Tūjué (Tūjué Kěsà bù:突厥可薩部; Tūjué Hésà:突厥曷薩), is transcribed with characters different from those used to render the Qa- in the Uyğur word 'Qasar'.The native religion of the Khazars is thought to have been Tengrism, like that of the North Caucasian Huns and other Turkic peoples.but the scope of the conversion within the Khazar Khanate remains uncertain.