a similar question was asked in one of the past AMAs on ancient egypt
https://www.reddit.com/r/AskHistorians/comments/7hawn2/ama_ancient_egypt/dqpvoyc/
by u/osarnachthis
https://www.reddit.com/r/AskHistorians/comments/7hawn2/ama_ancient_egypt/dqpt762/
/u/lucaslavia