Jacques I (Jacques François Léonor Goyon de Grimaldi, Monégasque: Giàcumu Françese Liunardu Goyon de Matignon; 21 November 1689 – 23 April 1751) was Prince of Monaco from 1731 to 1733. He was also Duke of Valentinois from 1716 until 1733, and Count of Thorigny. For ten months preceding his regency, he had served as prince consort to his wife, Princess Louise Hippolyte.
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Life and reign
Jacques came from an ancient Norman family. "Thorigny" is now called Torigni-sur-Vire, where the Mairie is the former family chateau, the Château des Matignon. His uncle was Marshal Charles Auguste de Goÿon de Matignon.
He was a son of Jacques Goÿon de Matignon, jure uxoris Comte de Thorigny, and Charlotte Goyon de Matignon, Comtesse de Thorigny suo jure.
When Antonio I of Monaco and his wife Marie de Lorraine-Armagnac were looking for a consort for their daughter and heir Louise Hippolyte of Monaco, the family proposed him as a candidate. His candidacy was supported by King Louis XIV of France, who wanted to solidify French influence in Monaco.
Jacques and Louise Hippolyte married on 20 October 1715 and had nine children. The wedding ceremony was the first official act that the five-year-old king, Louis XV, carried out during the Regency of Philippe II, Duke of Orléans.
The marriage wasn't very happy. Jacques preferred to stay more in Versailles, where he had several mistresses, than in Monaco.