E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Good Duke Humphrey.
Humphrey Plantagenet, Duke of Gloucester, youngest son of Henry IV., said to have been murdered by Suffolk and Cardinal Beaufort. (Shakespeare: 2 Henry VI., iii. 2.)
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Called Good, not for his philanthropy, but from his devotion to the Church. He was an out-and-out Catholic.