protector

noun

a person or thing that protects; guardian; defender
Eng. History
1. a person ruling a kingdom during the minority, absence, or incapacity of the sovereign
2. the title held by Oliver Cromwell (1653-58) and his son Richard (1658-59), during the British Protectorate
  in full Lord Protector

Related Forms:

See protector in American Heritage Dictionary 4

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