Jonas, Justus yo͝os´to͝os yō´näs [key], 1493–1555, German Protestant reformer. In 1521, Jonas, then a professor at the Univ. of Erfurt, accompanied Martin Luther to the Diet of Worms. During their intimate friendship Jonas assisted Luther with the translation of the Bible. He also translated the Latin works of Luther and Melanchthon into German. He was present at Luther's death and preached his funeral sermon.
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