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Masolino da Panicale (c.1383-c.1440) Santi Gregorio Magno e Mattia (Saint Gregory? and Saint Matthias) c.1428–1429 Tempera grassa and oil on poplar, transferred to fibreboard, 126.3 x 59.1 cm National Gallery, London Saint Matthias is shown holding the axe that was used…