The Siamese military state emerged from the disintegration in the 14th century of the once powerful Khmer Empire. Once a powerful military state centred on what is today termed Cambodia, the Khmer dominated the region through the use of irregular military led by captains owing personal loyalty to the Khmer warrior kings, and leading conscripted peasants levied during the dry seasons. Primarily based around its infantry, the Khmer army was typically reinforced by war elephants and later adopted ballista artillery from China.