 Until the mid 7th century, the residents of ancient Peshawar had a ruling elite of Central Asian Scythian descent, who were then displaced by the Hindu Shahis of Kabul.Islam is believed to have been first introduced to the Buddhist and Zoroastrian inhabitants of Puruṣapura in the later 7th century.As the first Pashtun tribe to settle the region, the Dilazak Pashtuns began settling in the Valley of Peshawar, and are believed to have settled regions up to the Indus River by the 11th century.