THE history of the Inquisition naturally divides itself into two portions, each of which may be considered as a whole. The Reformation is the boundary-line between them, except in Spain, where the New Inquisition was founded by Ferdinand and Isabella. In the present work I have sought to present an impartial account of the institution as it existed during the earlier period. For the second portion I have made large collections of material, through which I hope in due time to continue the history to its end. The Inquisition was not an organization arbitrarily devised and imposed upon the judicial system of Christendom by the ambition or fanaticism of the Church.