 Catholics, Eastern Orthodox, and Oriental Orthodox consider the term to refer to a single institutional one true church, while Protestant ecclesiology considers it to refer to a church invisible referred to as the Christian Church.Following the pejorative term "papist", attested in English since 1534, the terms "Popish Catholic" and "Romish Catholic" came into use during the Protestant Reformation.From the 17th century, "Roman Catholic Church" has been used as a synonym for the Catholic Church by some Anglicans and other Protestants in English-speaking countries.