It’s argued that the reformation began at 4 different dates. These dates are 1505, 1516, 1517 and 1521. This is because in :
1505 – Martin Luther was in a close life encounter, in a thunderstorm which almost killed him. He promised he’d devote his life to God if he spared his life. True to his word, he joined the priesthood immediately.
1516 – He discovered a phrase in his bible which he believed to differ from the of Catholicism.
1517 – Luther nailed the 95 thesis on the Church door at Wittenberg.
1521 – Martin Luther is accused of Heresy and was ordered to recount.