For 10 points, name this ancient historian who coined the term dynasty and wrote about the pharaohs of Egypt.
According to one source, this historian concluded that all of history insofar has encompassed 24,800 years, which can be divided into three dominions of gods, heroes and men. His surviving work is subdivided into categories like Heracleopolitans, Diospolitans and Thinites. Continuations of this priest's historical work have been written by the Libyan Apion and Chaeremon. His major treatise only exists in fragmentary form, as preserved by Sextus Africanus, Eusebius of Caesarea and most importantly Josephus, who claims that this historian recorded Menes was devoured by a hippo at the beginning of his reign. Jean Francois Champollion used his work to do his most notable action, and his writing was sponsored by the reigning king Ptolemy I.  For 10 points, name this ancient historian who coined the term dynasty and wrote about the pharaohs of Egypt.
According to one source, this historian concluded that all of history insofar has encompassed 24,800 years, which can be divided into three dominions of gods, heroes and men.
Manethon