Hincmar of Laon refused to recognize the authority of his metropolitan, and entered into an open struggle with his uncle, who exposed his errors in a treatise called Opusculum capitulorum, and procured his condemnation and deposition at the synod of Douzy (871).
Three other works, entitled Adversaria, Chronicon, 606-960, and Opusculum de vitis Romanorum pontificum, are usually, but wrongly, assigned to Liudprand.