Jansen, Ellert an Anabaptist martyr, suffered during the persecutions of the Anabaptists near the middle of the 16th century in the Low Countries, then under the- government of Charles V. In the year 1549 he was imprisoned at Amsterdam, with nineteen other Anabaptists. 'He was a tailor by trade, but his mental capacity and force of character designated him as a man well qualified even for one of the learned professions. While his other friends escaped from prison, he remained behind; determined to profess openly his peculiar Christian views, or die in defense of them. March 20, 1549, he finally suffered the so much coveted martyrdom by burning. See Brown, Baptist Mart. p. 67.