What empire merged with Egyptian empire around 747 BC?

Around 747 BC, the Kingdom of Kush, an ancient empire located to the south of Egypt, merged with the Egyptian empire. This union was marked by the rise of the 25th Dynasty of Egypt, often referred to as the Kushite Dynasty, which ruled over both Egypt and Kush. The Kushites brought a revitalization of Egyptian culture and religion during their reign. This period is notable for its significant architectural and artistic achievements, including the construction of pyramids.