'The Annunciation', 1465-1470. Light heralds the Saviour, the dove signals the presence of the Holy Spirit, Museu Calouste Gulbenkian, Portugal. (Photo by Art Media/Print Collector/Getty Images)
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Hulton Archive Print Collector

'The Virgin and Child with Saints', 1460's. Saint Peter and Saint Paul with the Virgin and Christ as a child, National Gallery, London. (Photo by Art Media/Print Collector/Getty Images)
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Hulton Archive Print Collector

'The Virgin and Child', c1453-1494. Private collection. (Photo by Art Media/Print Collector/Getty Images)
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Hulton Archive Print Collector

'The Virgin and Child with Saints', c1490-1505. Found in the collection of the National Gallery, London. (Photo by Art Media/Print Collector/Getty Images)
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Hulton Archive Print Collector