 Kapol in the Persian language means Royal (ka) Bridge (pol), which is due to the main bridge on the Kabul River that connected the east and west of the city.In 420 AD the Indo-Sassanids were driven out of Afghanistan by the Xionite tribe known as the Kidarites, who were then replaced in the 460s by the Hephthalites.It became part of the surviving Turk Shahi Kingdom of Kapisa, also known as "Kabul-Shahan".