Pashtunization (پښتون جوړونه), also called Pathanization, is a process of cultural or linguistic change in which someone or something non-Pashtun becomes acculturated to Pashtun influence. Pashtuns are the largest ethnic group in Afghanistan and second-largest in Pakistan. List of Pashtun empires and dynasties People become Pashtunized when they settle in Pashtun-dominated areas and adopt Pashtun culture and language. Pashtunization is a specific form of cultural assimilation and has been taking place in Pashtun-populated regions of Afghanistan and Pakistan for several centuries. "In the eighth and ninth centuries, ancestors of many of today's Turkic-speaking Afghans settled in the Hindu Kush area (partly to obtain better grazing land) and began to assimilate much of the culture and language of the Pashtun tribes already present there." The Khalaj were originally a Turkic tribe which had long domiciled in the Ghazni, Qalati Ghilji (also known as Qalati Khalji), and Zabulistan regions of present-day Afghanistan. They intermarried with the local Pashtuns and gradually adopted the Pashtun culture. Najib Bakran's geography, Jahān Nāma (c. 12001220), described the Khalaj as a "tribe of Turks" that had been going through a language shift. Some of them left the area during the Mongol invasion of Central Asia towards the Indian subcontinent, where they built empires such as the Khalji dynasty of Delhi. Because of their language shift and Pashtunization, the Khalji were looked upon as Pashtuns (Afghans) by the Turkic nobles of the Delhi Sultanate. The Safi are also stated to be originally Dardic and spoke Pashayi language, who gradually Pashtunized after conversion to Islam. Other pashtunized Dardic tribes include Afridi, Swati and Shilmani. Pashtunization may also refer to the settling of Pashtun tribes onto lands where non-Pashtun tribes live or more broadly the erosion of the customs, traditions and language of non-Pashtun peoples due to the political power and regional influence of the Pashtuns.