The Five Solas are five Latin phrases that emerged during the Reformation to summarize the Reformers’ theological convictions about the essentials of Christianity The Protestant Reformation of the 16th century changed Christianity forever. Roused to action by the corruption and abuses they saw in the Roman Catholic church of the time, visionary pastors and leaders like Martin Luther and John Calvin spearheaded a movement that transformed Christianity and eventually led to the emergence of the Protestant denominations that exist today