The word YAB derive from the kushan's title YABGU.

http://tangra-bg.org/eng/knigi/bv18.htm

http://en.wikipedia.org/wiki/Kushan_Empire

The Kushan Empire (c. 1st–3rd centuries) was a state that at its height, about 105–250, stretched from what is now Tajikistan to Afghanistan, Pakistan and down into the Ganges river valley in northern India. The empire was created by the Kushan tribe of the Yuezhi confederation, an Indo-European people[2] from the eastern Tarim Basin, China, possibly related to the Tocharians. They had diplomatic contacts with Rome, Persia and China, and for several centuries were at the center of exchange between the East and the West.

http://en.wikipedia.org/wiki/Yuezhi

Yuezhi , Yeh-Chih or Da Yuezhi , also , "Great Yuezhi") "The Great Clan of Yue", is the Chinese name for an ancient Central Asian people. There are numerous theories about the derivation of the name Yuezhi and none has yet found general acceptance.[5][6] In Chinese the name translates literally as 'Moon Clan.' According to Zhang Guang-da the name Yuezhi is a transliteration of their own name for themselves, the Visha (the tribes), being called the Vijaya in Tibetan.[7]. They are believed by many scholars to have been the same as or closely related to the Indo-European people named Tocharians by ancient Greeks. They were originally settled in the arid grasslands of the eastern Tarim Basin area, in what is today Xinjiang and western Gansu, in China, before they migrated to Transoxiana, Bactria and then northern South Asia, where they formed the Kushan Empire.

Early Kushans

Head of a Kushan prince (Khalchayan palace, Uzbekistan).Some traces remain of the presence of the Kushan in the area of Bactria and Sogdiana. Archaeological structures are known in Takht-I-Sangin, Surkh Kotal (a monumental temple), and in the palace of Khalchayan. Various sculptures and friezes are known, representing horse-riding archers[6], and significantly men with artificially deformed skulls, such as the Kushan prince of Khalchayan[7] (a practice well attested in nomadic Central Asia). On the ruins of ancient Hellenistic cities such as Ai-Khanoum, the Kushans are known to have built fortresses. The earliest documented ruler, and the first one to proclaim himself as a Kushan ruler was Heraios. He calls himself a "Tyrant" on his coins, and also exhibits skull deformation. He may have been an ally of the Greeks, and he shared the same style of coinage. Heraios may have been the father of the first Kushan emperor Kujula Kadphises.

Direct archaeological evidence of a Kushan rule of long duration is basically available in an area stretching from Surkh Kotal, Begram, the summer capital of the Kushans, Peshawar, Taxila and Mathura, the winter capital of the Kushans.[8]

Other areas of probable rule include Khwarezm (Russian archaeological findings)[9] Kausambi (excavations of the Allahabad University),[10] Sanchi and Sarnath (inscriptions with names and dates of Kushan kings),[11] Malwa and Maharashtra,[12] Orissa (imitation of Kushan coins, and large Kushan hoards).[13]

The recently discovered Rabatak inscription tends to confirm large Kushan dominions in the heartland of India. The lines 4 to 7 of the inscription[14] describe the cities which were under the rule of Kanishka, among which six names are identifiable: Ujjain, Kundina, Saketa, Kausambi, Pataliputra, and Champa (although the text is not clear whether Champa was a possession of Kanishka or just beyond it).[15][16][17]

Northward, in the 2nd century CE, the Kushans under Kanishka made various forays into the Tarim Basin, seemingly the original ground of their ancestors the Yuezhi, where they had various contacts with the Chinese. Both archaeological findins and literary evidence suggest Kushan rule, in Kashgar, Yarkand and Khotan.[18]

As late as the 3rd century CE, decorated coins of Huvishka were dedicated at Bodh Gaya together with other gold offerings under the "Enlightenment Throne" of the Buddha, suggesting direct Kushan influence in the area during that period.[19]

Kujula Kadphises (30–80)

Tetradrachm of Kujula Kadphises (30–80 CE) in the style of Hermaeus.According to the Hou Hanshu: "the prince (xihou) of Guishuang (Badakhshan and the adjoining territories north of the Oxus), named Kujula Kadphises (Ch: , "Qiujiuque") attacked and exterminated the four other princes (xihou). He set himself up as king of a kingdom called Guishuang."[20]

He invaded Anxi (Parthia) and took the Gaofu (Kabul) region. He also defeated the whole of the kingdoms of Puda, and Jibin (Kapisha-Gandhara). Qiujiuque (Kujula Kadphises) was more than eighty years old when he died."

These conquests probably took place sometime between 45 and 60, and laid the basis for the Kushan Empire which was rapidly expanded by his descendants.

Kujula issued an extensive series of coins and fathered at least two sons, Sadaa (who is known from only two inscriptions, especially the Rabatak inscription, and apparently never have ruled), and seemingly Vima Taktu.

Kujula Kadphises was the great grandfather of Kanishka.


Vima Taktu (80–105)

Bronze coin of Vima Takto. Corrupted Greek legend .] "Basileu[s] Basileur [Megas?]": "The King of Kings, [Great?] Saviour".Vima Takt[u] (or Tak[to], Ancient Chinese: Yangaozhen ) is not mentioned in the Rabatak inscription (Sadashkana is instead. See also the reference to Sims-William’s article below). He was the predecessor of Vima Kadphises, and Kanishka I. He expanded the Kushan Empire into the northwest of the Indian subcontinent. The Hou Hanshu says:

"His [Kujula Kadphises'] son, Yangaozhen (Vima Taktu), became king in his place. He conquered Tianzhu (Northwestern India) and installed a General to supervise and lead it. The Yuezhi then became extremely rich. All the kingdoms call [their king] the Guishuang (Kushan) king, but the Han call them by their original name, Da Yuezhi."[21]

Vima Kadphises (105–127)

Vima Kadphises.Vima Kadphises (Kushan language: ) was a Kushan emperor from around 90–100 CE, the son of Sadashkana and the grandson of Kujula Kadphises, and the father of Kanishka I, as detailed by the Rabatak inscription.

Vima Kadphises added to the Kushan territory by his conquests in Afghanistan and north-west India. He issued an extensive series of coins and inscriptions. He was the first to introduce gold coinage in India, in addition to the existing copper and silver coinage.


Kanishka I (127–147)

Kanishka I.The rule of Kanishka I, the second great Kushan emperor, fifth Kushan king, who flourished for at least 28 years from c. 127. Upon his accession, Kanishka ruled a huge territory (virtually all of northern India), south to Ujjain and Kundina and east beyond Pataliputra, according to the Rabatak inscription:

"In the year one, it has been proclaimed unto India, unto the whole realm of the governing class, including Koonadeano (Kaundinya< Kundina) and the city of Ozeno (Ozene, Ujjain) and the city of Zageda (Saketa) and the city of Kozambo (Kausambi) and the city of Palabotro (Pataliputra) and so long unto (i.e. as far as) the city of Ziri-tambo (Sri-Champa)." Rabatak inscription, Lines 4–6.

The Qila Mubarak fort at Bathinda was built by Kanishka.His territory was administered from two capitals: Purushapura (now Peshawar in northern Pakistan) and Mathura, in northern India. He is also credited (along with Raja Dab) for building the massive, ancient Fort at Bathinda (Qila Mubarak), in the modern city of Bathinda, Indian Punjab.

The Kushans also had a summer capital in Bagram (then known as Kapisa), where the "Begram Treasure", comprising works of art from Greece to China, has been found. According to the Rabatak inscription, Kanishka was the son of Vima Kadphises, the grandson of Sadashkana, and the great-grandson of Kujula Kadphises. Kanishka’s era is now generally accepted to have begun in 127 on the basis of Harry Falk’s ground-breaking research.[22][23] Kanishka’s era was used as a calendar reference by the Kushans for about a century, until the decline of the Kushan realm.


Vasishka
Vasishka was a Kushan emperor, who seems to have a short reign following Kanishka. His rule is recorded as far south as Sanchi (near Vidisa), where several inscriptions in his name have been found, dated to the year 22 (The Sanchi inscription of "Vaksushana" – i. e. Vasishka Kushana) and year 28 (The Sanchi inscription of Vasaska – i. e. Vasishka) of the Kanishka era.


Huvishka.
Huvishka (140–183)
Huvishka (Kushan: , "Ooishki") was a Kushan emperor from the death of Kanishka (assumed on the best evidence available to be in 140 CE) until the succession of Vasudeva I about forty years later. His rule was a period of retrenchment and consolidation for the Empire. In particular he devoted time and effort early in his reign to the exertion of greater control over the city of Mathura.


Vasudeva I (191–225)

Gold coin of Vasudeva I.Vasudeva I (Kushan: "Bazodeo", Chinese: "Bodiao") was the last of the "Great Kushans." Named inscriptions dating from year 64 to 98 of Kanishka’s era suggest his reign extended from at least 191 to 225 CE. He was the last great Kushan emperor, and the end of his rule coincides with the invasion of the Sassanids as far as northwestern India, and the establishment of the Indo-Sassanids or Kushanshahs from around 240 CE.

The title Yabgu was borrowed by the Türks from the Kushan political tradition, preserved by the Hephtalites.[3]

Friedrich Hirth suggested that the earliest title "Yabgu" was recorded in literary Chinese with regard to Kushan contexts with transliteration Xihou "e-khu (yephou)" [4] (Chinese: literally "United/Allied/Confederated Prince"). However, the Chinese does not make clear whether the title was the one bestowed on foreign leaders or rather a descriptive title indicating that they were allied, or united.

http://www.ziezi.net/tangra/

THE FIRST ANCIENT GOD of the BULGARIANS is TANGRA. I Y I

THE NAMES of TANGRA are -- KHAN TENGRI, TENGRI, TINGRI and TARA - see mongolian and turk couple TENGRI - UMAI like SHIVA - UMA couple.

http://www.siddharthasintent.org/gentle/GV13-2.htm

http://www.fallingrain.com/world/PK/6/Tangra.html

http://www.ziezi.net/tangra/

http://oaks.nvg.org/phadampa-sangay.html

http://panbulgar.16.forumer.com/a/proves-of-existen_post46.html

http://www.tibet-tours.com/fengguang/ShowArticle.asp?ArticleID=2064

http://www.geonames.org/1279916/tangra-yumco.html