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How one man used research by historians at University College London into Britain's forgotten slave-owners to track down the descendants of the family who'd owned his ancestors two centuries earlier. Dr James Dawkins tells Louise Hidalgo how his quest led him to the famous evolutionary biologist, Professor Richard Dawkins, author of the Selfish Gene, with whom he shares a name and a past. Picture: slaves unloaded from slave ship at their destination; from Amelia Opie The Black Man's Lament: or How to Make Sugar, London, 1826 (Credit: Universal History Archive/Getty Images)