(Πίονις), a descendant of Heracles, from whom the town of Pionia in Mysia was believed to have derived its name. (Strab. xiii. p.610 ; Paus. 9.18.3.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890