Maristow House in West Devon has a rich, remarkable yet little-known history. In the seventeenth century two sons from a family of Exeter merchants helped establish the sugar plantations of Jamaica and the resulting trade in African slaves. One became the island's governor while the other married the daughter of a Civil War hero and one of the first owners of the house. His Jamaican grandson took over the estate in the 1730s and produced an heir who rebuilt the mansion to reflect the style and architecture of Georgian England. These changes were paid for largely by the proceeds of slave...