An Egyptian priest, Manetho, writing in the third century BC, said that Thutmose I's reign lasted 12 Years and 9 Months (or 13 Years). This data is supported by two dated inscriptions from Years 8 and 9 of his reign with Thutmoses's cartouche found on a stone block in Karnak. Accordingly, Thutmose is usually said to have ruled from 1506 BC to 1493 BC, but some scholars date him from 1526 BC to 1513 BC