Analysis of information sources in references of the Wikipedia article "Muslim conquests of Afghanistan" in English language version.
Modern Afghanistan was part of ancient India; the Afghans belonged to the pale of Indo-Aryan civilisation. In the eighty century, the country was known by two regional names—Kabul land Zabul. The northern part, called Kabul (or Kabulistan) was governed by a Buddhist dynasty. Its capital and the river on the banks of which it was situated, also bore the same name. Lalliya, a Brahmin minister of the last Buddhist ruler Lagaturman, deposed his master and laid the foundation of the Hindushahi dynasty in c. 865.
Ibn Battuta, the renowned Moroccan fourteenth century world traveller remarked in a spine-chilling passage that Hindu Kush means slayer of the Indians, because the slave boys and girls who are brought from India die there in large numbers as a result of the extreme cold and the quantity of snow.