Appeal to the poor masses and have them attack their current nobles whilst supporting the new nobles with false promises of benevolence, whilst in reality they're 100x greedier (something like 1/3rd of all land and money was in the church's hands by rome's fall). tear down the statues and practices of the old culture, replace it. use foreign immigrants to infiltrate, then rile them up. tell the masses they're oppressed. incite wars, then offer the needed money for mercenaries with conditions attached (the real reason why constantine just suddenly embraced christianity during his civil war.. no he didn't see some dumb cloud). convert the gullible women first, then they will shame men into joining. prop up a false opposition (mithraism back then, freemasonry or 'satanism' today) then manipulate leaders telling them that if they don't embrace christianity and become a leader of it, they will soon lose all their power to the other rapidly growing cult (jews will do this soon.. they are purposely pushing overt 'satanist' crap with the left hand so they can 'save us' later with the right.. this was extremely obvious with the whole trump admin.. they all either fell for it or were in on it). create bad economic conditions and blame it on the nobles they hate. (hoard grain, hoard property) create false martyrdom stories to maintain an eternal victim complex. form mobs and attack others, especially public speakers. censor all other opinions.