All this knowledge was transferred to the Greeks probably shortly after the conquest by Alexander the Great (331 BC). According to the late classical philosopher Simplicius (early 6th century AD), Alexander ordered the translation of the historical astronomical records under supervision of his chronicler Callisthenes of Olynthus, who sent it to his uncle Aristotle. Although Simplicius is a very late source, his account may be reliable. He spent some time in exile at the Sassanid (Persian) court and may have accessed sources otherwise lost in the West. It is striking that he mentions the title "tèresis" (Greek: guard), which is an odd name for a historical work, but is an adequate translation of the Babylonian title "MassArt" meaning "guarding," but also "observing." Anyway, Aristotle's pupil Callippus of Cyzicus introduced his 76-year cycle, which improved on the 19-year Metonic cycle, about that time. He had the first year of his first cycle start at the summer solstice of 28 June 330 BC (Proleptic Julian calendar date), but later he seems to have counted lunar months from the first month after Alexander's decisive battle at Gaugamela in fall 331 BC. So Callippus may have obtained his data from Babylonian sources and his calendar may have been anticipated by Kidinnu. Also it is known that the Babylonian priest known as Berossus wrote around 281 BC a book in Greek on the (rather mythological) history of Babylonia, the "Babyloniaca", for the new ruler Antiochus I; it is said that later he founded a school of astrology on the Greek island of Kos. Another candidate for teaching the Greeks about Babylonian astronomy/astrology was Sudines who was at the court of Attalus I Soter late in the 3rd century BC.