Mursili II
The annals of Mursili II record that in the 3rd year of his reign, which would be 7 years prior to Mursili's eclipse in 1312 BC, prince Piyama-Kurunta of Arzawa stood against his army at Walma by the river Astarpa. Mursili defeated him at the river. Mursili chased Piyama-Kurunta into Apasa. The following winter, Mursili withdrew to the Astarpa to prepare for the next season.