The Nuttall Encyclopedia
German theologian, of Swabian birth, professor at Ingolstadt; a violent, blustering antagonist of Luther and Luther's doctrines; in his zeal went to Rome, and procured a papal bull against both; undertook at the Augsburg Diet to controvert Luther's doctrine from the Fathers, but not from the Scriptures; was present at the conferences of Worms and Regensburg (1486-1543).
Wood, James, ed. Entry for 'Eck, John'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/e/eck-john.html. Frederick Warne & Co Ltd. London. 1900.