For Thing #1:
If you want brother vs. brother and civil war, look into the Onin War, which took place during the Muromachi era in Japan.
If you want religious overtones, look into the Shimabara Rebellion. When the Tokugawa shoguns crushed that rebellion, they executed the leader (who was Christian) and from that point on, Christian persecution became that much worse.
I don’t know if either of these things will work for you but maybe they might get some ideas flowing.