The Kingdom of Kush was an ancient Nubian state centered on the confluences of the Blue Nile, White Nile and River Atbara. It was established after the Bronze Age collapse and the disintegration of the New Kingdom of Egypt, centered at Napata in its early phase. After King Kashta (“the Kushite”) invaded Egypt in the 8th century BC, the Kushite kings ruled as Pharaohs of the Twenty-fifth dynasty of Egypt for a century before being defeated and driven out by the Assyrians. At the height of their glory, the Kushite conquered an empire that stretched from what is now known as South Kordofan all the way to the Sinai. King Piye attempted to expand the empire into the Near East, but was thwarted by the Assyrian kingSargon II. The Kingdom of Kush is mentioned in the Bible as having saved the Israelites from the wrath of the Assyrians, although disease among the besiegers was the main reason for the failure to take the city. The war that took place between King Taharqa and the Assyrian King Sennacherib was a decisive event in western history, with the Nubians being defeated in their attempts to gain a foothold in the Near Eastby Assyria. Sennacherib’s successor Esarhaddon went further, and invaded Egypt itself, deposing Taharqa and driving the Nubians from Egypt entirely. Taharqa fled back to his homeland where he died two years later. Egypt became an Assyrian colony; however, king Tantamani, after succeeding Taharqa, made a final determined attempt to regain Egypt. Esarhaddon died while preparing to leave the Assyrian capital of Ninevehin order to eject him. However, his successor Ashurbanipal sent a large army into southern Egypt and routed Tantamani, ending all hopes of a revival of the Nubian Empire. During Classical Antiquity, the Nubian capital was at Meroë. In early Greek geography, the Meroitic kingdom was known as Ethiopia (a term also used earlier by the Assyrians when encountering the Nubians). The civilization of Kush was among the first in the world to use iron smelting technology. The Nubian kingdom at Meroe persisted until the 4th century AD. After the collapse of the Kushite empire several states emerged in its former territories, among them Nubia.
Info from https://en.wikipedia.org/wiki/Sudan