The Five Solas identified the distinctive theological positions held by the reformers and continue to serve as distinguishing characteristics of Reformed Theology. Here is a brief description of each, as well as links to additional information. http://reasonabletheology.org/five-solas
John Calvin (1509–1564) was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. John Calvin was Martin Luther's successor as the preeminent Protestant theologian. Calvin made a powerful impact on the fundamental doctrines of Protestantism, and is widely credited as the most important figure in the second generation of the Protestant Reformation.