The Prince Regent reference article from the English Wikipedia on 24-Apr-2004
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Prince Regent

Prince Regent is a title normally associated with King George IV of the United Kingdom, who held it during the incapacity of his father, King George III of the United Kingdom (see Regent for other regents). Regent's Park and Regent Street in London are named after him.

This period is known as the English Regency, or just the Regency.