Who United Upper and Lower Egypt?

According to the work of ancient historian Manetho and his work "Aegyptica" (History of Egypt), King Manes conquered the north “Lower Egypt” and unified both kingdoms in 3118 B.C.

Exactly who the first king of unified Egypt was is still a point of contention among historians, as Manetho’s work was often disputed. According to the historian Eratosthenes, it is believed that Manetho’s King Manes (also called Meni) was the Pharaoh Narmer who peacefully united Upper and Lower Egypt under one rule. The most powerful piece of data supporting this fact is the Narmer Palette, an ancient artifact depicting a king whose name is given as Nar-Mer in the hieroglyphs.