1517 was the year that Martin Luther nailed his 95 Theses to the Castle Church door in Wittenberg. You may read them at the link below.
Martin Luther was the one who protested against the catholic church (pope) for selling indulgences.
Martin Luther
Because they protested against the Catholic church.
John Calvin is a person who went up against the Catholic church .
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Protestants were the people who during the European Reformation protested against the Roman Catholic Church.
.Roman Catholic AnswerMost of the people who protested against the Church in the sixteenth century were heretics and apostates. Today they are, more politically correct, known as "protestant reformers" by those who followed them.
Lutheranism, set up by Martin Luther in 1555 when he protested against the Roman Catholic church.
Martin Luther protested against church abuses.
Protestant's.
Protesetants
The Albigensians, the Cathars, and John Calvin were all Catholic heretics who left the Church.