Prince regent

//ˌpɹɪns ˈɹiːd͡ʒ(ə)nt// noun

Definitions

Noun
  1. 1
    A prince who rules a country as a regent in place of a monarch who is unfit to rule for a particular reason.

    "Accord betwixt D. Raymond Berenger, Prince Regent of Arragon, with the Templers and Hospitaliers, vpon the teſtament of King D. Alphonſo."

Etymology

From prince + regent (“one who rules in place of the monarch”). The plural form princes regent treats the word regent attributively.

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