The Yamatian Invasion refers to the time between the years 1001–1003 AE in the Third Age when the Yamatians suddenly attacked their neighbouring countries and conquered them with help from the Clergy of Mardük and the Clergy of Nergal. The first nation to fall was Libaterra, and soon other nations followed. Invading Aison took the longest time, but the Yamatians eventually succeeded in securing its heartlands as well.