Supposed portrait of Matthias Grünewald

Engraving according to the Half length portrait of a man with a pinfeather looking up, therefore according to the most recent research probably not an image of Grünewald but rather of a study of the writing John the Evangelist on PatmosDeutsch: Stich nach dem Brustbild eines aufwärts blickenden Mannes mit Federkiel, damit nach der jüngeren Forschung wohl kein Bildnis Grünewalds, sondern eher einer Studie des schreibenden Evangelisten Johannes auf Patmos

John was banished to Patmos by the Roman authorities during the reign of the emperor Domitian, where he wrote the book of Revelation, the final book of the New Testament. In works of art, St. John is often shown holding a book or scroll, symbolizing the text of Revelation, or with a quill pen, signifying his role as an author.