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Erasistratus, a physician, realising that Antiochus's (son of Seleucus I) illness 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.. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)