Major-General William Rainsborowe | |
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| Born | Wapping, London, England |
| Died | 19 December 1673 (aged 61) |
| Education | Magdalene College, Cambridge |
| Occupation(s) | Mariner, Businessman |
| Known for | Adventurer, Parliamentarian, Leveller, Amongst the first English Colonists of New England |
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Major William Rainsborowe (? – fl. 1612–1673), or Rainborowe, was an officer in the English Navy and New Model Army in England during the English Civil War and the Interregnum. He was a political and religious radical who prospered during the years of the Parliamentary ascendancy and was an early settler of New England in North America.