protector (def. 2b).
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the title given to Oliver Cromwell and later to his son Richard (1626–1712) during the period after the ↑English Civil War known as the ↑Protectorate (1653–9). During this time Cromwell and his son claimed greater powers to rule the country, including the power to rule independently of Parliament.
See also: ↑Protector
Useful english dictionary. 2012.