User blog comment:The Brave Wolf/Assassin's Creed: Origins - New Rumor May 9th 2017/@comment-5088097-20170509174549/@comment-18014300-20170511224501

Yeah I was really confused as to why Kyros of Zarax is from the 6th century BCE. As much as I don't like retcons, in this case, it might just make more sense for them to change it back to the correct century.

I still don't think 5th dynasty makes sense at all. Sure, they want a more distant time period, but they still have massive room for creative liberties with the 4th dynasty (where the Great Pyramids were built) or the 6th dynasty (where the 94-year reign Pepi II led to the dynasty's decline due to his outliving even his grandchildren), but literally nothing we know happened in the 5th dynasty, a footnote in history as far as I know. Even if their game is set during the reigns of Hatshepsut to Tutankhamun, they still have plenty of room to be creative with details because Egyptian records are still quite scant even for those famous pharaohs. There's a lot of mystery still surrounding the specifics of the political turmoil that erupted in the wake of Akhenaten's attempt to impose monotheism, Tutankhamun's early death, and his successors' conflicts.