Descendants of the ancient sovereign rulers, later Dukes of Brittanny, founded by Conan, ruling in 384. Guetenoch, Viscount of Porhoët living 1026 built castle of Joscelin and was grt-grandfather of Alain, Viscount of Rohan (Morbihan) ca 1128; Jean I, Viscount of Rohan (d 1395) m 1st Jeanne of Leon (d 1372), who brought the Lordship of Leon to the Rohans, giving them first place in the Parlement and Estate of Brittanny, and m 2ndly 1377 Jeanne of Navarre, dau of Jeanne of France, Queen of Navarre (dau of Louis X, King of France) and Philip III, King of Navarrem, and had sons by 1st and 2nd. He was succ by his eldest son, Alain VIII, Viscount of Rohan (d 1429) m Beatrix de Clisson, heiress of County of Porhoët, and had issue, Alain IX, Viscount of Rohan, Lord of Leon, Count of Porhoët (d 1461) m 1stly 1407 Marguerite of Brittanny (d 1428), dau of Jean V, Duke of Brittanny and Jeanne of Navarre; he m 2ndly Marie of Lorraine-Vaudemont and had issue by 2nd, Jean II, Viscount of Rohan, etc (d 1516) m 1455/61 Marie of Brittanny, dau of François I, Duke of Brittanny and Isabelle Stuart, Princess of Scotland, and was eventually succ through his elder daughter Anne (who m her cousin Pierre de Rohan) by René I, Viscount of Rohan, who assumed the style Prince of Leon, and was grandfather of Henry II de Rohan (1579-1638), 1st Duke of Rohan & Peer of France (Apr 1603, registered 7 Aug 1603), whose elder surv dau Marguerite (1630-1684), m 1645 Henry Chabot, and were ancestors of the family of ROHAN-CHABOT, Dukes of Rohan (see that family). Charles de Rohan, Lord of Guemenée (d 1438), son of Jean I and Jeanne of Navarre (see above), was gradnfather of Louis II de Rohan, Lord of Guemenée (d 1508), cr Baron of Lanvaux 13 Aug 1485. Louis VI de Rohan, 5th Baron of Lanvaux, for whom the barony of Montbazon was erected into a County Feb 1547, registered 10 Dec 1549 and the Lordship of Guemenée into a principality 1570, was father of Louis (d sp 1589) for whom the County of Montbazon was erected into a Duchy-Peerage by LP May 1588 (mpr), registered 27 Apr 1589 (in which the family is described as descending from the first King of Brittanny), confirmed and continued for his brother Hercules de Rohan by LP Mar 1594, registered 13 Mar 1595 with precedence from the earlier creation. Title of Prince of Soubise assumed by right of that Lordship 1667; recognized as "Prince Étranger habitué en France" during 17th and 18th centuries; Lordship of Frontenay-l'Abbatu in Saintonge, erected into Duchy-Peerage of Rohan-Rohan, Oct 1714, registered 18 Dec 1714, extinct 1787; Prince of Rochefort 1728, Count (styled Prince ca 1743) of Montauban. Count of the French Empire 2 Jul 1808; Recognition in Austria of the title of Fürst (Prince) and "Hochgeboren" 17 Jun (diploma 27 Nov) 1808 (for 7th Duke, d 1808); Peer of France (life) 4 June 1814; Hereditary Peer 19 Aug 1815 and Duke-Peer 31 Aug 1817 for 9th Duke of Montbazon Charles (d 24 Apr 1836). Serene Highness, Austria 24 Dec 1825 (this title extinct in the male line 10 Dec 1846, but renewed for the line of Rohan-Rochefort, Austria 23 Jun 1830, diploma, Vienna 15 May 1833). Succession to the properties of the Duchy of Bouillon (but without the sovereign rights thereto) attributed to Prince Charles-Louis de Rohan-Rochefort, father of Prince Benjamin (see below), by judgment of the Tribunal of Leipzig 1 Jul 1816, in execution of decision of Congress of Vienna of 6 Mar 1815 that Bouillon was to be returned to legitimate heir, this person to be identified by commission appointed by the Powers with no right of appeal. Sovereignty of Bouillon accorded to Luxembourg 9 Jun 1815. Decision in favor of Prince Charles de Rohan was appealed by the descendants of the daughters of the 3rd Duke, the Duke of Bourbon (Prince of Condé), Princess Louise-Adelaide of Bourbon-Condé, the Princess of Poix (Duchess of Mouchy), and the Duke of La Trémoille, & on 4 May 1817 the Grand Duke, King of the Netherlands, declared this appeal ultra vires, reversing this decision on 19 Jun 1819 in favor of the plaintiffs. On 24 Oct 1821 the Grand Duke conceded 200,000 florins to the Prince de Rohan to follow the substitution of 1696. The Court of Liège found in favour of the appellants 24 Jul 1824, and confirmed this 16 Nov 1825. [The ancient Sovereign Duchy (titles assumed by Godfrey of Bouillon, Duke of Upper and Lower Lorraine, Advocate of the Holy Sepulchre 1100) of Bouillon, had been sold or ceded to the Bishop of Liège by Godfrey ca 1099; William de La Marck, Constable of Bouillon, to whom the Bishop of Liège, Duke of Bouillon, mortgaged the Duchy 21 May 1484, with the failure of the Bishop to redeem the mortgage, assumed the sovereignty and title of the Duchy; Bouillon captured by the Emperor 1521 and returned to the Bishop but retaken by France and Robert II de La Marck's rights reserved in the Treaty of Cateau-Cambresis 1529 (La Marck retained Lordships, styled Principalities, of Sedan, Jametz and Raucourt and a small portion of Bouillon); Robert III (d 1536) and Robert IV (d 1556), cr Marshal of France, recognized as Dukes of Bouillon in French LP; Henri de la Tour, Viscount of Turenne (d 1623), m 15 Oct 1591 Charlotte de la Marck, titular Duchess of Bouillon, Princess of Sedan, etc, she d 8 May 1594 and by her will 8 Apr 1594 the titular Duchy and other possessions passed to her husband. His rights challenged by the La Marck male heir and the Duke of Montpensier, but by settlement dated 24 Oct 1594 and French LP 13 Jul 1648 the rivals relinquished their claims to the La Tour heir in return for financial settlement. Henri, Duke of Bouillon, accorded the title of Duke of Bouillon à brevet June 2, 1607 and February 29, 1612, and his sons accorded status of Prince Étranger April 2 1649, October 26 1649 and February 15, 1652. Sedan and Raucourt surrendered to France in exchange for the Duchy-Peerages of Albret and Château-Thierry 20 Mar 1651; possession of Bouillon recovered for 3rd Duke 1 May 1678 who established system of succession by the "substitution" of 13 Jan 1696 giving rights to certain females and their descendants after extinction of male line. The 6th Duke of Bouillon adopted (25 Jun 1791) as his eventual heir Lt Philip d'Auvergne, RN, whose genealogical proof of attachment to the La Tour d'Auvergne family was recorded by the English College of Arms and confirmed by royal license of George III 27 Feb 1792, failing his succession to the male line of Barons (style Princes) de la Tour d'Apchier (male line extinct 1897, sometime styled Dukes of Bouillon), and La Trémoille (male line extinct 1934). Bouillon National Assembly published Constitution with assent of the Duke 23 Mar 1792. Last La Tour Duke deposed by annexation of Duchy to France 25 Oct 1795, and d sp Feb 1802. Vice-Admiral Philip d'Auvergne (d by suicide 18 Sep 1816 sp) put in possession of Bouillon by British troops May 1814 and adopted Prince de La Trémoille, Prince de Tarente, as his heir (with apparent assent of Bouillonnais); Prince Charles de Rohan, nephew and nearest relative of the last Duke, counter-claimed, appealing to Congress of Vienna, see above].

Hereditary member of the Austrian House of Lords 18 Apr 1861. Head of the House: Duke of Montbazon and Bouillon, Duke-Peer of France, Prince of Guemenée, prince of Rohan, Serene Hignness; cadets, Prince of Princess of Rohan and Serene Highness.