Why did the Kingdom of Kush move its capital from Napata to Meroë?

Assyrian invasions destabilized the Nubian rulers in Thebes, causing the last pharaoh of the Ethiopian Dynasty to flee to Napata. Then, once strengthened, the Egyptians pushed back. The Egyptian army sacked Napata in 593 BCE and, in response, the Nubian rulers moved their capital farther south to Meroe.

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Kush

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He therefore, led an expedition against Kush, destroying towns, temples, monuments stele and finally the city of Napata before he grew bored with the campaign and returned to Egypt.