Pepi II is often mentioned as the longest reigning monarch in history, due to a 3rd-century BC account of Ancient Egypt by Manetho, which accords the king a reign of 94 years; this has, however, been disputed by some Egyptologists due to the absence of attested dates known for Pepi I after his 31st count (Year 62 if biennial) such as Hans Goedicke and Michel Baud. Ancient sources upon which Manetho's estimate is based are long lost, and could have resulted from a misreading on Manetho's behalf (see von Beckerath). The Turin canon attributes 90+ years of reign to Pepi II, but this document dates to the time of Ramesses II, 1,000 years later, and its accuracy for the reign length of the Old Kingdom king, Pepi II, is uncertain.