Thettalus was another one of Herakles' children and like most was illegitimate.  Thettalus's mother was Khalkiope daughter of Eurypylus.

Parents

Herakles & Khalkiope

Spouse & Lovers

Children

Antiphus
Phidippus
Nesson

Ancient Text

by Khalkiope, daughter of Eurypylus, he had Thettalus

Apollodorus - [2.7.8]

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