The 25th Dynasty's reunification of Lower Egypt, Upper Egypt, and Kush created the largest Egyptian empire since the New Kingdom. They assimilated into society by reaffirming Ancient Egyptian religious traditions, temples, and artistic forms, while introducing some unique aspects of Kushite culture. It was during the 25th dynasty that the Nile valley saw the first widespread construction of pyramids (many in what is now Sudan) since the Middle Kingdom.
Important: This Nubian dynasty ruled over both upper and lower Egypt for over 100 years. It is considered the last true dynasty of ancient Egypt. The dynasties to follow were Assyrian controlled puppet dynasties.