Amenhotep I
Manetho's Epitome states that Amenhotep I ruled Egypt for twenty years and seven months or twenty-one years, depending on the source. While Amenhotep I's highest attested regnal year is only his Year 10, Manetho's statement is confirmed by a passage in the tomb autobiography of a magician named Amenemhet. This explicitly states that he served under Amenhotep I for 21 years. Thus, in the high chronology, Amenhotep I is given a reign from around 1546 to 1526 BC and, in the low chronology, from around 1526 to 1506 BC or 1525 to 1504 BC, though individual scholars may ascribe dates to his reign that vary from these by a few years.