The Count of Hainaut was the ruler of the county of Hainaut, a historical region in the Low Countries (including the modern countries of Belgium, the Netherlands, Luxembourg and parts of northern France and western Germany). In English-language historical sources, the title is often given the archaic spelling Hainault.
Reginar I (r. 870-898), also Count of Mons (from 870) and Count of LiègeSigard (r. 898-908, m. 920), also Count of LiègeReginar I (r. 908-915), second timeReginar II (r. 915-after 932)Reginar III (r. before 940-958)Godfrey I (r. before 958-964)The Count of Hainaut was then divided between the cities of Mons and Valenciennes.
Counts of Mons
Richar (r. 964-973), also Count of LiègeRenaud (r. 973)Reginar IV (r. 973-974)Godfrey II (r. 974-998)Reginar IV (r. 998-1013), second timeReginar V (r. 1013-1039), acquired the southern part of the Brabant province around 1024Herman (r. 1039-1051), married Richilde, acquired Valenciennes around 1045 or 1049Counts and Margraves of Valenciennes
Amaury (r. 953-973)Werner (r. 973)Reginar IV (r. 973-974)Arnulf (r. 974-988)Baldwin IV (r. 988-1035)Baldwin V (r. 1035-1045)Valenciennes and Mons are once again reunited in a consolidated County of Hainaut.
House of Flanders
Baldwin I (r. 1051-1070), also Count of FlandersArnulf I (r. 1070-1071), son of Baldwin VI, also Count of FlandersBaldwin II (r. 1071-1098), son of Baldwin IBaldwin III (r. 1098-1120), son of Baldwin IIBaldwin IV (r. 1120-1171), son of Baldin IIIBaldwin V (r. 1171-1195), son of Baldwin IV, also Count of Flanders from 1191Baldwin VI (r. 1195-1205), son of Baldwin V, also Count of Flanders and Latin Emperor of ConstantinopleJoan (r. 1205-1244), daughter of Baldwin VI, also Countess of FlandersMargaret I (r. 1244-1253), daughter of Baldwin VI, also Countess of Flanders, married first to Bouchard IV of Avesnes and then William of DampierreThe Counties of Flanders and Hainaut are claimed by Margaret's sons, the half-brothers John I of Avesnes and William III of Dampierre in the War of the Succession of Flanders and Hainault. In 1246, King Louis IX of France awards Hainaut to John, but Margaret refuses to hand over the government but was forced to do so in 1254 by John and the German anti-king William II, Count of Holland.John I (r. 1253-1257), son of Margaret I and Bouchard IV of AvesnesHouse of Flanders
Margaret I (r. 1257-1280), resumed control after John I's deathJohn II (r. 1280-1304), son of John I, also Count of HollandWilliam I (r. 1304-1337), son of John II, also Count of HollandWilliam II (r. 1337-1345), son of William I, also Count of HollandMargaret II (r. 1345-1356), daughter of William I,jointly with her husband Louis IV, Holy Roman Emperor (d. 1347) and their son William IIIWilliam III (r. 1345-1388), son of Margaret II and Louis IVjointly with his brothers Louis the Brandenburger, Louis the Roman and Otto the Bavarian (1347-1349),
Stephen II of Bavaria (1347-1353) and Albert IMargaret returned in 1350 in opposition to her son and held Hainaut until 1356.Albert I, (Regent since 1358, ruled as count 1388-1404)William IV (r. 1404-1417), son of Albert IJacqueline (r. 1417-1432), daughter of William IVJacqueline was opposed by her uncle John, Duke of Bavaria-Straubing, son of Count Albert I in a war of succession. John's claims devolved upon Philip III, Duke of Burgundy, a nephew of William III, whose mother had been the sister of William. In 1432 he forced Jacqueline to abdicate from Hainaut and Holland in his favour.Philip I the Good (r. 1432-1467)Charles I the Bold (r. 1467-1477), son of Philip the GoodMary the Rich (r. 1477-1482), daughter of Charles the Bold, jointly with her husband Maximilian I, Holy Roman EmperorPhilip II the Handsome (r. 1482-1506), son of Mary and MaximilianCharles II (r. 1506-1555), son of Philip, also Holy Roman Emperor (as Charles V)Charles II proclaimed the Pragmatic Sanction of 1549 eternally uniting Hainaut with the other lordships of the Low Countries in a personal union. When the Habsburg empire was divided among the heirs of Charles V, the Low Countries, including Hainaut, went to Philip II of Spain, of the Spanish branch of the House of Habsburg.
Philip III (r. 1555-1598), son of Charles III, also King of SpainIsabella Clara Eugenia (r. 1598-1621), daughter of Philip II,jointly with her husband Albert, Archduke of Austria)Philip IV (r. 1621-1665), grandson of Philip III, also King of SpainCharles III (r. 1665-1700), son of Philip IV, also King of SpainBetween 1706 and 1714 the Low Countries were invaded by the English and the Dutch during the War of the Spanish Succession. The fief was claimed by the House of Habsburg and the House of Bourbon. In 1714, the Treaty of Rastatt settled the succession and the County of Hainaut went to the Austrian branch of the House of Habsburg.
Charles IV (r. 1714-1740), great grandson of Philip III, als Holy Roman Emperor (elect)Mary Theresa (r. 1740-1780), daughter of Charles IV, married Francis I, Holy Roman EmperorJoseph I (r. 1780-1790), son of Maria Theresa and Francis I, also Holy Roman EmperorLeopold (r. 1790-1792), son of Maria Theresa and Francis I, also Holy Roman EmperorFrancis II (r. 1792-1835), son of Leopold II, also Holy Roman EmperorThe title was factually abolished in the aftermath of the French revolution and the annexation of Flanders by France in 1795. Although, the title remained officially claimed by the descendants of Leopold II until the reign of Charles I of Austria.
House of Saxe-Coburg and Gotha
In the modern Kingdom of Belgium, the title of "Count of Hainaut" was traditionally given to the eldest son of the crown prince, who was himself styled "Duke of Brabant". In 2001, with the birth of Princess Elisabeth of Belgium (now Duchess of Brabant), heir and eldest daughter of Prince Philippe, Duke of Brabant (now Philippe, King of the Belgians), it was decided not to feminize and award her the title of Countess of Hainaut, but to abolish it.
Prince Leopold, Duke of Brabant (1859–1865), son of Leopold II of BelgiumBaudouin I of Belgium (1930–1934), son of Leopold III of Belgium 
