Eusorus only appeared in various stories as the father of certain figures otherwise he has no myth of his own:
Apollonius' account
"And about the isthmus and the plain the Doliones had their dwelling, and over them Cyzicus son of Aeneus was king, whom Aenete the daughter of goodly Eusorus bare."[3]
Hyginus' account
"Cyzicus, son of Eusorus, king in an island of the Propontis, received the Argonauts with generous hospitality"[5]
Orphic Argonautica
"Cyzicus, the son of Aeneus who ruled over all the Doliones, came up and took a place among the heroes. He had been born to a most noble woman, Aenete, daughter of Eusorus."[4]
Apollodorus' account
"A period of nine years having elapsed, allies came to join the Trojans: surrounding cities,...Acamas, son of Eusorus..."[1]