Saka group. Furthemore Pashto and Ossetian, another Scythian-descending language, share cognates in their vocabulary which other Eastern Iranian languages lack Cheung suggests a common isogloss between Pashto and Ossetian which he explains by an undocumented Saka dialect being spoken close to reconstructed Old Pashto which was likely spoken north of the Oxus at that time. Others however have suggested a much older Iranic ancestor given the affinity to Old Avestan. Hephthalite (White Hun) theory Yu. V. Gankovsky, a Soviet historian proposes an Ephthalite origin for the Pashtuns: According to Georg Morgenstierne, the Durrani tribe who were known as the "Abdali" before the formation of the Durrani Empire 1747, might be connected to with the Hephthalites; Aydogdy Kurbanov endorses this view who proposes that after the collapse of the Hephthalite confederacy, Hephthalite likely assimilated into different local populations. Others draw different conclusions. Ghilji tribe has been connected to the Khalaj people. Following al-Khwarizmi, Josef Markwart claimed the Khalaj to be remnants of the Hephthalite confederacy. The Hephthalites may have been Indo-Iranian, although the view that they were of Turkic Gaoju origin "seems to be most prominent at present". The Khalaj may originally have been Turkic-speaking and only federated with Iranian Pashto-speaking tribes in Medieval times. However, according to linguist Sims-Williams, archaeological documents do not support the suggestion that the Khalaj were the successors of the Hephthalites, while according to historian V. Minorsky, the Khalaj were "perhaps only politically associated with the Hephthalites." Anthropology and oral traditions Theory of Pashtun descent from Israelites Some anthropologists lend credence to the oral traditions of the Pashtun tribes themselves. For example, according to the Encyclopaedia of Islam, the theory of Pashtun descent from Israelites is traced to Nimat Allah al-Harawi, who compiled a history for Khan-e-Jehan Lodhi in the reign of Mughal Emperor Jehangir in the 17th century. The 13th century Tabaqat-i Nasiri discusses the settlement of immigrant Bani Israel at the end of the 8th century CE in the Ghor region of Afghanistan, settlement attested by Jewish inscriptions in Ghor. Historian André Wink suggests that the story "may contain a clue to the remarkable theory of the Jewish origin of some of the Afghan tribes which is persistently advocated in the Persian-Afghan chronicles." These references to Bani Israel agree with the commonly held view by Pashtuns that when the twelve tribes of Israel were dispersed, the tribe of Joseph, among other Hebrew tribes, settled