Answer:
Everyone was building up their military so that they would be bigger than the competition. Eventually, things were so tense due to everyone building bigger and bigger weapons and enlisting more soldiers. Things just blew up from there.
The empire became divided between its western and eastern portions. The Eastern Empire (referred to later as the Byzantine Empire) lasted longer politically. However, Constantine's shift of the capital away from Rome also facilitated the rise of greater power for the pope in Rome as the head of religion and culture in the West.
A note on the religious developments: Constantine's own conversion to Christianity, and his subsequent legalization of the Christian religion, legitimized the Christian faith as the accepted religious path, favored in the empire. Constantine sought to unify the empire under Christian faith agreement, calling for the Council of Nicea to meet near Constantinople in 325 AD (which produced the Nicene Creed). Also, Constantine's move of the capital to "New Rome" (Constantinople) left the Bishop of Rome as the strongest leadership figure in Rome itself, which enabled the development of the power of the papacy.
The most suitable option is they believed that the Church had moved away from its core teachings and became corrupt.
Between 1400 and 1500 occured significants changes in the Roman Catholic Church. During this period, people criticized that Cardinals and Popes were concentrated in worldly issues instead of caring for faith. They lived more than kings living in luxury while peope starved to death and many of their practices did not match with what the Bible said. These are the reasons why people wanted to reform the Catholic Church.
Yes the uncle and a mob beat him to death