In the first reading Paul, on being invited to speak of Christianity's roots in the Old Testament, gave a summary of fifteen centuries of ancient Jewish history, leading to the coming of Christ.
Could you carry on from there?
At the Last Supper Jesus told the Apostles he would lead them to all truth.
In 325 the Council of Nicea taught that Jesus is true God as well as being true man,
In 400 St. Augustine taught that we cannot save ourselves.
In 500 Clovis, king of the Franks, put the clergy on the social level of the nobility.
In 1563 the Council of Trent made Friday abstinence and Sunday Mass obligatory