AshurbanipalPronunciation: /ˌaʃʊəˈbanɪpal, -ˈbanɪpɑːl/Definition of Ashurbanipal king of Assyria circa 668–627 bc, grandson of Sennacherib. A patron of the arts, he established a library of more than 20,000 clay tablets at Nineveh. Ashurbanipal in other Oxford dictionaries Definition of Ashurbanipal in the US English dictionary