a reform movement, begun by Martin Luther, in 1517 that resulted in the split of Western Christianity.
➡Causes: problems with the Catholic Church(simony, selling of pardons, absenteeism, indulgences, pluralisms, corruption of the Ren. Popes, Babylonian Captivity, Great Schism), criticism of the Catholic Church(95 Theses, "salvation is achieved by faith alone", "Priesthood of all believers", Jon Hus, Erasmus).
➡consequences: counter reformation-->council of Trent, jesuits, corruption of the papacy, religious warfare.
I hope I can help you...☺