When was the start of the Egyptian period during which the reign of Tantamani took place?
Tantamani Tantamani (Assyrian "UR-daname"), Tanutamun or Tanwetamani (Egyptian) or "Tementhes" (Greek) (d. 653 BC) was a Pharaoh of Egypt and the Kingdom of Kush located in Northern Sudan and a member of the Nubian or Twenty-fifth dynasty of Egypt. His prenomen or royal name was Bakare which means "Glorious is the Soul of Re."
Neferirkare Neferirkare (sometimes referred to as Neferirkare II because of Neferirkare Kakai) was an ancient Egyptian pharaoh of the Eighth Dynasty during the early First Intermediate Period (2181–2055 BC). According to the egyptologists Kim Ryholt, Jürgen von Beckerath and Darell Baker he was the 17th and final king of the Eighth Dynasty. Many scholars consider Neferirkare to have been the last pharaoh of the Old Kingdom, which came to an end with the 8th Dynasty.