What is "acessamenus"

In Greek mythology, Acessamenus was a king of Pieria. He was known as the founder and eponym of Akesamenai, a city in Macedonia.

In the Iliad, Acessamenus is mentioned as father of several daughters, the eldest of whom, Periboea, had a son Pelagon by the river god Axius; Pelagon, in his turn, was the father of the Trojan ally Asteropaios.