Callisthenes of Olynthus ((/kəˈlɪsθəˌniːz/); Greek: Καλλισθένης; c. 360 – 328 BC) was a Greek historian. He was the son of Hero (niece of Aristotle), the daughter of Proxenus of Atarneus and Arimneste, which made him the great nephew of Aristotle by his sister Arimneste. They first met when Aristotle tutored Alexander the Great. Through his great-uncle's influence, he was later appointed to attend Alexander the Great on his Asiatic expedition as the official historian.