The river Gandak must have been the route of the movement of Buddha and his followers from Nepal Tarai to Magadh that is why many of the stupas and similar structures, including Ashoka pillars, are found on the banks of the river. The location of Pathar ki Masjid just opposite the meeting point of the gandak, that is southern bank of the Ganges, shows the Muslim influence of trade and commerce in medieval times. The current township Patna is just the modern version of the makeshift headquarters of military establishments of old Patna city which in turn was later version of Pataliputra, the capital of Maurya Empire.