The First Battle of Myridia took place during the Yamatian Invasion of Aison in the Aisonian capital of Myridia. The combined forces of the Clergy of Mardük and Yamato launched an attack on the Aisonian Heartlands, catching the Aisonian forces completely by surprise with such a bold move. The Yamatians succeeded in taking over Myridia and forced King Byron Kagawest and many Aisonian loyalists to flee to the Glenfiddich Range.