History of Egypt
Manetho was a priest in the time of the Ptolemies in the third century BC. His "Aegyptiaca" (History of Egypt) divided the rulers into dynasties, which forms the basis of the modern system of dating Ancient Egypt. His work has been lost and is known only in fragmentary form from later writers quoting his work. As a result of the suppression of the Amarna kings, Manetho is the sole ancient record available.