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Erasistratus, a physician, realising that the illness of Antiochus (son of Seleucus I) is lovesickness for his stepmother Stratonice, by observing that Antiochus's pulse rose when ever he saw her. Coloured engraving by W.W. Ryland, 1772, after Pietro da Cortona. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.