Philip Joseph, Prince of Salm-Kyrburg

Philip Joseph was the second son of Hendrik Gabriel Joseph of Salm-Kyrburg, regent of Salm-Kyrburg from 1696 to 1716, and his wife Princess Maria Theresia de Croÿ. He had an elder brother, John, and a sister, Henriëtte (who married Maximilian, Prince van Hornes, who already had two daughters from a previous marriage, the eldest of whom later married Philip Joseph).

The Salm-Mörchingen family lost the titles of "Wildgrave of Dhaun" and "Rhinegrave of Stein" in 1681, when they lacked a male successor. Salm-Kyrburg was from then on run by regents on their behalf. Philip Joseph reigned with his brother John from 1716. When Salm-Kyrburg again arose, this time as a principality, Philip Joseph became its first prince.

He married in 1742 to Princess Maria Theresa van Hornes (1725-1783), who was made her father's sole heir in 1763, with his titles and country estates thus passing to the princes of Salm-Kyrburg. Emanuel's other daughter, Princess Elisabeth of Hornes, widow of Gustaaf Adolf, Prince of Stolberg-Gedern and mother of Charles Edward Stuart's wife Louise, agreed to this without protest.

Philip Joseph and Maria Theresa had 10 children, including a pair of twins:

• Marie Maximiliane Louise (1744–1790), married Jean Bretagne Charles de La Trémoille, duc de Thouars
• Frederick (1745–1794), later 2nd prince of Salm-Kyrburg
• Auguste Friederike (1747–1822), married Duke Anne Emmanuel de Croÿ
• Charles Augustus (1750)
• Marie Louise (born 1753, date of death unknown)
• Louis Joseph Ferdinand (1753–1774)
• Elisabeth Claudine (1756–1757)
• Amalie Zephyrine (1760–1841), married Anton Aloys, Prince of Hohenzollern-Sigmaringen
• Charles Albert Henry (1761)
• Maurice Gustav Adolf (1761–1813), married Countess Christiane von Wartenberg