Thesteus was the son of Agenor and Epicasta of Calydon. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Althæa (?-?).
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | king of Pleuron |