In Egyptian legend, the first king of Egypt was Menes. At least, Menes is the form of the king's name that was used by the 3rd century B.C. historian Manetho. Two other first dynasty kings' names are associated with Menes, Narmer (as in the Narmer Palette) and Aha.
There are various etymologies for the name, including an attempt to connect Menes with the name of the city he founded, Memphis, which he reclaimed by means of dam construction.Diodorus Siculus refers to Manas as the first law-giver. Menes is credited with introducing papyrus and writing (Pliny), founding cities, building dikes and more.
Manetho says Menes' dynasty had 8 kings and that a hippopotamus carried off Menes at the end of his life.
Source: Steve Vinson "Menes" The Oxford Encyclopedia of Ancient Egypt. Ed. Donald B. Redford, Oxford University Press, Inc.,
"Pharaoh Menes' death after an anaphylactic reaction - the end of a myth," by J. W. Krombach, S. Kampe, C. A. Keller, and P. M. Wright, [Allergy Volume 59, Issue 11, pages 1234-1235, November 2004]