With the introduction of Buddhism, the city gained more prominence and the great building era began. The Mahavamsa states that King Kutakannatissa built the first city wall to a height of seven cubits with a moat in front of the wall. This fortification was further enlarged by raising the wall a further 11 cubits to 18 cubits by King Vasabha. The king also added fortified gatehouses at the entrances of which the ruins can be seen to date. The Mahavamsa also states that soothsayers and architects were consulted in the construction.