Eckebert
Eckhart von Schönau († 1184 ) was the brother of St. Elizabeth of Schönau. He joined in 1155 or 1156 in the convent of the Benedictine men Schönau a. The visions of his sister he wrote down in Latin.
Later he became abbot of the monastery Schönau.
His thirteen sermons against the Cathars ( Sermones contra Catharos ) were written after 1163, after the combustion of some Cathars under the Archbishop of Cologne, Reinald of Dassel, which have previously been questioned by Eckhart. The name Cathar was used in German for the first time by Eckhart, and he was from then on as heretics the usual term for every heretic. After Charles Schmidt, it is the only work by a German author against the Cathars.
His writings have been published by Friedrich Wilhelm Emil Roth. The Latin text of the sermons against the Cathars, and the visions of Elizabeth is reprinted in Volume 195 of the Patrologia Latina.