The duke was married twice. Both wives were from Legitimist families of the French high nobility. He married first at Paris on 17 September 1845 Marie-Paule de Pérusse des Cars (3 February 1827, Paris - 18 September 1855, Pau), daughter of
Amédée-François-Régis de Pérusse des Cars, 2nd
Count and 1st
Duke of Cars, Peer of France. They had four children: • '''Casimir de Blacas d'Aulps, 3rd Duke of Blacas, 3rd Prince of Blacas''' (23 October 1847 – 26 July 1866,
Velletri). His life was representative of the engagements of French Legitimists of the time. A devout Catholic, he enrolled at 18 in the
Papal Zouaves on 9 June 1866 to take part in the defense of the
Papal States and went to Italy, but he died there from Typhoid the following month. He had been Duke only five months. • Louise-Henriette-Marie (7 July 1849, Abondant - 3 February 1934, Paris), married in Paris on 10 April 1872 with Count René Hurault de Vibraye (6 October 1842, Paris - 20 December 1907, Paris). • Marie-Augustine-Yvonne de Blacas d’Aulps (1 January 1851 – 21 Octobre 1881, Aressel, Austria), married on 14 June 1870 in Paris to Alexander, 4th Prince of
Sayn-Wittgenstein-Sayn (14 July 1847, Paris - 12 August 1940, Hachenburg). • '''Pierre de Blacas d'Aulps, 4th Duke of Blacas, 4th Prince of Blacas''' (27 May 1853, Paris – 13 December 1937
Beaupréau), succeeded his brother as Duke. He married on 30 August 1884 Honorine de Durfort-Civrac (26 November 1855 Beaupréau - 1 June 1920 Beaupréau), daughter of Marie-Henri-Louis de Durfort, 2d Marquis of Civrac (a cadet branch of Dukes of Lorge) and had posterity. On 28 July 1863, the Duke remarried with Alix-Laurence-Marie de Damas (1824–1879), daughter of
Ange-Hyacinthe de Damas de Cormaillon, 1st Baron of Damas, Peer of France, who had been
Minister of foreign affairs (1823–1828) and
Minister of war (1823–1824) of Charles X. They had only one daughter: • Marie-Thérèse de Blacas d'Aulps (22 July 1864, Verignon – 8 February 1959, Aups). He died in Venice at the
Palazzo Cavalli, the residence of the comte de Chambord, after planning a study of Venetian coinage. His body was taken back to Aups where his funeral took place. ==References==