Louis-Philippe was the son of Louis, duc d'Orléans [1703-1752] and his wife, Auguste-Marie-Jeanne, princess of Bade [d. 1726], and the grandson of Philippe II, duc d'Orléans [1674-1723] and Françoise-Marie de Bourbon, legitimatized daughter of Louis XIV. Philippe II was regent for the five-year old Louis XV upon the death in 1715 of Louis XIV. During his regency, Philippe II endeavored to secure his own secession over that of Philip V of Spain, Louis XIV's grandson, if the sickly Louis XV were to die. In 1716 he concluded an alliance with Great Britain ensuring the latter's support against Philip V's claim of secession. France and Great Britain went to war with Spain in 1719, and in 1720 Philip V was forced to renounce his claims and recognize Philippe II as Louis XV's heir. Philippe II's machinations to secure his secession turned out to be for naught; his Regency ended when Louis XV came of age in 1723, and Philippe II died the following year. His grandson Louis-Philippe was lieutenant general and governor of Dauphiné. From 1757 Louis-Philippe lived in seclusion as a great patron of the performing arts. His first wife died in 1759 and he was secretly married, in 1773, to the Marquise de Montesson. [Compiled from sources and references recorded on CMS]