Fathers of the Church
Father of the Church is a title bestowed on the most influential theologians of the early centuries of Christianity, those who have helped most strongly to shape the nature of orthodox Christian belief. You will find brief outlines of some of the more important in the category:Fathers of the Church.
There is an adjective meaning 'to do with Fathers of the Church' - patristic.
Patristics is a branch of theology. It means 'the study of the [lives, teaching etc of the] Fathers of the Church'.