By 653 BC Tantamani's successor Atlanersa was on the throne and he reigned solely over Nubia, with his seat of power in Napata, starting the so called Napatan period of Nubia. Although Atlanersa and his successors styled themselves as Egyptian pharaohs, none of them posed a serious threat to Egypt. After imposing his authority over Upper Egypt, Psamtik I established a garrison on Elephantine[1] and may have led a military campaign in Nubia.