Simply, the Roman Empire divided into the Western Roman Empire (based in Rome) and the Easter Roman Empire (based in Constantinople). Once the western empire fell, the Eastern Orthodox and Roman Catholic churches diverged and evolved in isolation.
The full history is significantly more complex, but that is the answer in a nut-shell.
the orthrodox church
At Taylor Slotin's house! Party time (:
The Catholic Church was the only church in the Middle Ages and the pope ruled the church and monarchies of Europe.
The Catholic Church
The only church in the Middle Ages was the Catholic Church. I am not sure what the question is asking about the church.
The Catholic church was the "state" and ruled the society of the middle ages.
The Roman catholic church during the middle ages in Europe can best be described as a church that was a stable influence. This was during a time where central governments were weaker.
The Catholic church was the only church so any religious celebrations or services were Catholic.
There was one church and one religion in the middle ages and that was Catholic. So, any timeline would be of the Catholic Church.
Albanian Byzantine Catholic Church Armenian Catholic Church Bulgarian Greek Catholic Church Chaldean Catholic Church Coptic Catholic Church Patriarchate Ethiopian Catholic Church Byzantine Church of Croatia, Serbia and Montenegro Greek Byzantine Catholic Church Hungarian Byzantine Catholic Church Italo-Albanian Byzantine Catholic Church Macedonian Catholic Church Maronite Catholic Church Melkite Greek-Catholic Church Romanian Greek-Catholic Church Ruthenian Byzantine Catholic Church Slovak Byzantine Catholic Church Syriac Catholic Church Patriarchate Syro-Malabar Catholic Church Syro-Malankara Catholic Church Ukrainian Greek-Catholic Church
There were no reformers. The Catholic church was in full control of the society.
There was no single view. See related link for an article on the Catholic Church in the Middle Ages.