Achaeus (Ancient Greek: Ἀχαιός; flourished 3rd century BC) was a Seleucid nobleman and was the second son born to King and founder of the Seleucid Empire Seleucus I Nicator and Sogdian noblewoman Apama I.[1]
Apama, wife of Seleucus I, was the daughter of the Sogdian Spitamenes (Arr. Anab. 7.4.6). She was the mother of Antiochus I and also of Achaios