Early in his reign, in March 656 BC, Psamtik I dispatched a powerful naval fleet to Thebes and compelled the then serving God's Wife of Amun, Shepenupet II, a daughter of Piye, to adopt Nitocris as her heir to this powerful office. The ceremony of the adoption and elevation of Nitocris I is commemorated in the well known Adoption Stela. It is not known at what date she assumed the office of Divine Adoratrice of Amun, but she served in this position until Year 4 of Apries in 585 BC.