Juan de Herrera
St. Gregory the Great
Sacristy, Monastery of Sobrado dos Monxes, Sobrado, Spain
The four corners of the sacristy feature statues of the four Fathers of the Church. Thus the papal tiara identifies St. Gregory, the only one of the four who served as Pope. His right hand holds an open book, referring to his voluminous writings. His left holds what appears to be a mace.
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Photographed at the monastery by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.