Reformed theology, also known as Calvinism, is a system of Protestant theology developed during the Reformation of the sixteenth century and further developed within Reformed and Presbyterian churches. This doctrine has become most closely associated with the French theologian and reformer John Calvin (1509-1564), though it was also developed and propounded by the reformers Martin Bucer, Heinrich Bullinger,Huldrych Zwingli, and Thomas Cranmer.
Among the central tenets of Calvinism are the five solas and a system of five core beliefs about God and man (the five points of Calvinism).
The "Five Solas" are five core doctrines that were formulated by the Protestant Reformers against the teaching of the Roman Catholic Church in the 16th century. They are named after the Latin word sola and its grammatical variants, which means "only" or "alone." They represent one of the major criticisms against the Roman Catholic Church, namely that it had added elements to the teaching of the Bible and held believers accountable for subscribing to them, even though, in the eyes of the Reformers, they distorted or contradicted Christian doctrine.
The five solas are:
The so-called "Five Points of Calvinism" are five key doctrines that were developed in opposition to Arminianism. They were distilled out of the heads of doctrine developed in the Canons of Dort, a creed of the early 17th century that summarizes the judgment by the Synod of Dort (1618-19) against the teachings of the Arminian Remonstrance.