The Protestant Reformation was a widespread theological revolt in Europe against the abuses and totalitarian control of the Roman Catholic Church. Reformers such as Martin Luther, Ulrich Zwingli, and John Calvin protested unbiblical practices of the Catholic Church and promoted a return to sound biblical doctrine. A key event was Luther posting his 95 Theses in 1517. The Reformation established key doctrines including that Scripture alone is the authority for faith, salvation comes by grace alone through faith alone because of Christ alone, and salvation is for God's glory alone. These "Five Solas" separated Protestantism from Roman Catholicism.