John Calvin was a great and Godly 16th Century Reformer & Theologian.  His extensive conservative, Bible-believing, writings are the basis of 5 Point Calvinism, simplified as "TULIP".

http://www.calvin.edu/about/about_jc.htm

http://www.ccel.org/c/calvin/

http://www.wsu.edu/~dee/REFORM/CALVIN.HTM

http://www.newadvent.org/cathen/03195b.htm