ἱκτήρ
From LSJ
οὐ γὰρ ἂν τό γε πραχθὲν ἀγένητον θείη → since he cannot make what was done as though it had not come to pass
English (LSJ)
ῆρος, ὁ,= ἱκέτης,
A a suppliant, S.OT185(lyr.), E.Heracl. 764(lyr.): as Adj., ἱ. κλάδοι S.OT143; θαλλός E.Supp.10. II Ζεὺς ἱκτήρ the protector of the suppliant, A.Supp.479.