- Thessalus, son of Jason and Medea and the twin of Alcimenes. He escaped being murdered by his mother and, after the death of Acastus, became king of Iolcus.
- Thessalus, son of Heracles and Chalciope. He was the father of Antiphus, Pheidippus and Nesson.
- Thessalus, son of Haemon.
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