Louis XV of France
Louis XV (15 February 1710 – 10 May 1774), known as Louis the Beloved (), was a monarch of the House of Bourbon who ruled as King of France from 1 September 1715 until his death in 1774. He succeeded his great-grandfather Louis XIV at the age of five. Until he reached maturity (then defined as his 13th birthday) on 15 February 1723, the kingdom was ruled by Philippe II, Duke of Orléans, as Regent of France.
Cardinal Fleury was his chief minister from 1726 until the Cardinal's death in 1743, at which time the young king took sole control of the kingdom.
Louis, comte de Narbonne-Lara
He was born at Colorno, in the Duchy of Parma. His mother was Françoise de Chalus (bap. Château de Châlus-Chabrol, Châlus, Haute-Vienne, 24 February 1734 - Paris, 7 July 1821, daughter of Gabriel de Châlus, seigneur de Sansac, and Claire Gérault de Solages), one of the ladies-in-waiting of Elizabeth, Duchess of Parma and Chamberlain-Major of Princess Marie Adélaïde of France. 
Her husband was a nobleman of Spanish descent Don Jean François, 1er duc de Narbonne-Lara Grandee of Spain 1st Class, Lieutenant General of the Army, Commander in Name of the King of the Dioceses of Castres, Albi and Lavaur, 1st Gentleman of the House of H.R.H. the Duke of Parma (Aubiac, Lot-et-Garonne, 27 December 1718 - 12 August 1806), son of François de Narbonne-Lara, seigneur d' Aubiac, and second wife Olympie Angélique de Goth. They married 10 July 1749, and had an older son Philippe, the 2e duc de Narbonne-Lara, without issue. 
However, it is alleged that Louis XV himself was the real father. The coevals attribute the count's paternity to the King of France Louis XV for, according to documents of the Military Archive, the comte Jean François de Narbonne-Lara had been wounded 8 years earlier in the War of the Austrian Succession (1747) becoming from that moment on unable of having any offspring. The baptism of Louis, comte de Narbonne-Lara is another indication of that paternity. His wife became thus the King's mistress, and not only his name was also Louis but also his countemporaries always remarked about the similarities between Louis and the King.