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John Nider (Johannes Nieder): born in Swabia, 1380; entered the Order of Preachers at Colmar; sent to Vienna for philosophical studies; finished his studies and was ordained at Cologne; active at the Council of Constance; returned to Vienna and taught as Master of Theology, 1425; prior of the Dominican convent at Nuremberg, 1427; served successively as socius to his master general and vicar of the reformed convents of the German province, in which capacity he maintained an earlier reputation as a reformer; prior of the convent of strict observance at Basle, 1431; became identified with the Council of Basle as theologian and legate; made embassies to the Hussites at the command of Cardinal Julian; as legate of the Council, succeeded in pacifying the Bohemians; travelled to Ratisbon to effect further reconciliation with them, 1434; proceeded to Vienna to continue reforming the convents; in dicussions following the dissolution of the Couneil of Basle joined the party in favour of continuing the Council in Germany, but abandoned it when the Pope remained firmly opposed; resumed his theological lectures at Vienna, 1436; twice elected dean of the University; author of various treatises, including (in German) the 'Goldene Harfen' (24 Golden Harps), based on the Collations of Cassianus; died at Colmar, 1438.