Nushibi and Duolu belonged to the Turkic tribes of the Chuy group, and spoke close dialects. The transfer of supremacy from the Duolu group to Nushibi had outcome reverberating across Erasian continent. Nushibi controlled, and benefited, from the operation of their section of the transcontinental trade road (Silk Road), and were in alliance with Sogdiana, a chain of small oasis principalities who were also members of the Western Turkic Khaganate, and served as main operators of the Silk Road. Nushibi interest in the Silk Road operation brought them, in addition to the Sogdians, into a coalition with Byzantine and China, two other superpowers interested in the east-west trade. In the west, the coalition included Khazars in the N. Caucasus, and Bulgars in the N. Pontic steppes. This alignment was opposed a coalition of two other powers, Persia and the Eastern Turkic Kaganate, which brought about the first world wars of the 7th century Early Middle Ages.Gumilev L.N., "Ancient Türks", Moscow, 'Science', 1967, Ch. 15 World War of the 7th century, http://gumilevica.kulichki.net/OT/ot15.htm (In Russian) Nushibi interests in the Western Turkic Kaganate were advanced by the Kagan Tong Djabgu Qaghan, known from the Armenian annals as "King of the North". The capital was located north of Chach (modern Tashkent) oasis. The period of Nushibi dominance was interrupted in 628 by a joined revolt of Karluks and Doulu tribes, and a consequent death of Tong Jabgu Qaghan from the hands of his uncle. In the interregnum, led by his uncle Külüg Sibir with a title Baghatur Qaghan, the Duolu fraction restored its former dominating position. The coup brought a considerable upshot, in 630 Baghatur-Qaghan had to grant Bulgars their independence and allow them reorganize as what became known as Great Bulgaria. Nushibi opposition to the usurper was headed by Ashina Nishu, a ruler with a seat in Paykend (Paikent), who ruled Bukhara province. Sibir-Khan was killed in 631, and Nushibi installed their choice, son of Tong-djabgu-kagan with a title Irbis Ishbara Sir Jabgu-Qaghan, whose title Sir received the graphically pejorative Chinese transliteration 肆 Sì (< MC */siɪH/) "impudent, undisciplined". Sy Jabghu Khagan was known to western contemporaries as Sinjibu and Silzibul but soon had to replace him with Ashina Nishu under a name Duolu Qaghan (632–634), probably to appease the northern Duolu tribes. The next succession followed the traditional lateral succession order, a younger brother of Nishu was enthroned with a title Yshbara