The Traditio Legis
St. John's Convent Church, Müstair, Switzerland
As in Byzantine images of those giving or receiving gifts from God or the Emperor, the saints have covered their hands with fine cloth to receive the keys (Peter on the left) and the book representing the Law (Paul on the right) from the enthroned Christ.
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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.