leaden heart-shaped case with the year 1782 engraved, was found in the church St. Pierre in Porrentruy, Switzerland. It contained a preserved heart. Preservation had been obtained with vegetable materials and was such that microscopic and electron-microscopic preparations could be made. Tt was the heart of the bishop of Basel, Frédéric de Wangen. The heart is studied anatomically, and the historical background of the find is presented.