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John Sergeant (born 1622, Barrow-upon-Humber, Lincolnshire, Eng.—died 1707, London) was an English Roman Catholic priest, notable for his criticisms of several of the leading thinkers of his time, including John Locke. After serving as secretary to Thomas Morton, Anglican bishop of Durham, Sergeant was converted to Roman Catholicism. He then took theological studies at the English College, Lisbon, was ordained (1650) and was sent on the English mission in 1652 to defend the Catholic cause....