The reformation - The usual term for the religious movement which made its appearance in Western Europe in the sixteenth century, and which, while aiming at an internal renewal of the Church, really led to a splintering of the Church
Various people wrote about why they had to reform the Catholic church and create new ways of being community including leaders such as Martin Luther
This Reformation Guide is intended to provide easy access to the wealth of Internet information available on the reformation period. The links to the original web sites have been preserved so that users may access the most recent developments.
This site gives good links to both Reformation and Catholic reformation information.
Wikipedia - Excellent information about Henry the VIII and the English Reformation.