Pepi II Neferkare Rules Egypt

Pepi II (reigned c. 2278 BC–c. 2184 BC) was a pharaoh of the Sixth dynasty in Egypt's Old Kingdom. His throne name, Neferkare (Nefer-ka-Re), means "Beautiful is the Ka of Re". He succeeded to the throne at age six, after the death of Merenre I, and is generally credited with having the longest reign of any monarch in history at 94 years (c. 2278 BC - c. 2184 BC) although this figure has been disputed by some Egyptologists who favour a shorter reign of not much more than 64 years. This is based on the complete absence of higher attested dates for Pepi beyond his Year after the 31st Count (Year 62 on a biannual cattle count).

http://en.wikipedia.org/wiki/Pepi_II_Neferkare