A son of Pelops and Dia, was king of Troezene, father of Aethra, and grandfather and instructor of Theseus. (Schol. ad Pind. Ol. i. 144, Eurip. Hippol. 11, Med. 683; Paus. ii. 30. § 8, i. 27. § 8; Apollod. iii. 15. § 7; Strab. viii. p. 374.) When Theseus married Phaedra, Pittheus took Hippolytus into his house. (Paus. i. 22. § 2.) His tomb and the chair on which he had sat in judgment were shown at Troezene down to a late time. (Paus. ii. 31. § 3.) He is said to have taught the art of speaking, and even to have written a book upon it. (ii. 31. § 4; comp. THESEUS.) Aethra as his daughter is called Pittheis. (Ov. Heroid. x. 31.)