In Greek mythology, Helisson (Ancient Greek: Ἑλισσὼν) was an Arcadian prince as one of the 50 sons of the impious King Lycaon^[1] either by the naiad Cyllene,^[2] Nonacris^[3] or by unknown woman. He was the reputed eponymous founder of the Arcadian town of Helisson, as well as the river of the same name.^[4]