Jacopo di Cione, The Crucifixion of St. Peter

Tempera and gold on wood panel
Pincoteca Vaticana, Rome

Images of St. Peter's death always show him crucified upside-down. So far I have seen only one other image with an angel bringing Peter a palm branch, the symbol of martyrdom, but most likely there are others.

Until the 16th century it was more common to show St. Peter affixed to the cross by ropes, but in this case the men use nails and blood flows plentifully from the saint's hands.

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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.