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Holy remains were hidden within the "sculpture"
At first, restorers thought that the "body" of St. Aurelius was an effigy. X-ray study confirmed that it contained the skeletal remains of a catacomb saint.

Credit: © Joana Palmeirão, in Imagem-relicário de Santo Aurélio mártir pertencente à Sé Catedral do Porto (Master’s Thesis, 2015)