Pierre Philippe Jean Marie d'Orléans (November 4,1845--July 17,1919) was Duke of Penthièvre and a grandson of French king Louis Philippe I. He was an officer in the Union and French Navies and an avid traveler.
Pierre Philippe Jean Marie d'Orléans (November 4,1845--July 17,1919) was Duke of Penthièvre and a grandson of French king Louis Philippe I. Declining a proposal to marry into Brazilian royalty, he chose a naval career and fathered two children without marrying. Prince Pierre was an officer in the Union and French Navies and an avid traveler.