Gouvernement Princier de Monaco
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Hann and Rosemont (earldom of)

The earldom of Hann and Rosemont is a fiefdom that was established as a result of the marriage of the Duke of Valentinois (the future Prince Honoré IV) to Louise d'Aumont-Mazarin in 1777.

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http://en.gouv.mc/Government-Institutions/History-and-Heritage/Places/Hann-and-Rosemont-earldom-of