Antiades is the son of Herakles and Aglaia who is one of the daughters of King Thespius. During his stay in the court of King Thespius, Herakles impregnated 49 out of the 50 of Thespius' daughters including Antiades who he lay with one night. The result of that particular encounter was Antiades.
"by Aglaia he [Herakles] had Antiades"
-Apollodorus. Biblioteca, 2.7.8