Khasekhemwy (ca. 2690 BC; sometimes spelled Khasekhemui) was the final king of the Second dynasty of Egypt. Little is known of Khasekhemwy, other than that he led several significant military campaigns and built several monuments, still extant, mentioning war against the Northerners. His name means "The Two Powerful Ones Appear".
According to Toby Wilkinson's study of the Palermo Stone in Royal Annals of Ancient Egypt, this near contemporary 5th dynasty document assigns Khasekhemwy a reign of 17.5 or nearly 18 full years. Wilkinson suggests that a reign of 18 "complete or partial years" can be attributed to Khasekhemwy since the Palermo Stone and its associated fragments record Years 3-6 and Years 12-18 of this king and notes that his final year is recorded in the preserved section of the document. Since the cattle count is shown to be regularly biennial during the second dynasty from the Palermo Stone (the year of the 6th, 7th and 8th count is preserved on the document plus full years after these counts respectively), a figure of c. 18 years is likely correct for Khasekhemwy. (or c. 18 years 2 months and 23 days from the main fragment of the Palermo Stone)