Task: Question Generation
Input (English): Context : Erechtheus (/ɨˈrɛkθjuːs, -θɪəs/; Ancient Greek: Ἐρεχθεύς) in Greek mythology was the name of an archaic king of Athens, the founder of the polis and, in his role as god, attached to Poseidon, as ``Poseidon Erechtheus''. 
Subject : Erechtheus 
Relation : spouse
Output (English): What is Erechtheus's spouse's name?