What was the reason of the Inquisition, who started it, and did it do what it was supposed to do?
closed as off topic by Isaac Moses♦ Sep 19 '11 at 0:42
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Here is the Wikipedia article on the topic.
If you are referring to the Spanish Inquisition this was done by King Ferdinand and Queen Isabella who were convinced by a friar to initiate it. It was obstensibly done to fight heresy but assumed they were fighting for more political authority versus the church's authority.