He is married to Marie de Champagne.
They got married.
Child(ren):
BAUDOUIN de Hainaut, son of BAUDOUIN V Comte de Hainaut [BAUDOUIN VIII Count of Flanders] & his wife Marguerite I Ctss of Flanders (Jul 1171-in prison in Bulgaria 11 Jun 1205). The Chronicon Hanoniense records the birth "1171 mense Iulio…Valencenis" of "filium…Balduinum" to "Balduinus [et] Margharetam…Mathie comitis Boloniensis sororem"[554]. The Flandria Generosa names (in order) "Balduinum, Philippum et Henricum" as the three sons of Count Baudouin and his wife Marguerite, specifying that Baudouin was later emperor of Constantinople[555]. He succeeded his mother in 1194 as BAUDOUIN IX Count of Flanders, and his father in 1195 as BAUDOUIN VI Comte de Hainaut. Under the Treaty of Dinant 26 Jul 1199, he acquired Namur. He did homage to Philippe II King of France for Flanders and Hainaut, but then allied himself with Richard I King of England in Sep 1197. War broke out with France, and by end 1198 Count Baudouin had overrun northern Artois[556]. He was obliged to agree the Treaty of Péronne with France in Jan 1200 in order to secure the release of his brother Philippe de Namur from French custody, agreeing to give up his alliance with England and receiving Saint-Omer, Aire and Guines in return[557]. He was among the first leaders to take the cross following the call of Pope Innocent III. A Flemish fleet arrived at Acre end 1202 under the command of Jean de Nesle, châtelain de Bruges[558]. After the army of the Fourth Crusade took control of Constantinople 13 Apr 1204, a council of six Venetians and six Franks met to elect a new Latin emperor, as agreed in the Acti Partitio Imperii Romanae the previous March between the crusaders and Venice. The votes of the Venetian block of electors ensured the success of Count Baudouin over the rival candidate, Bonifazio Marchese di Monferrato, Enrico Dandolo Doge of Venice considering Baudouin as the less powerful candidate[559]. At the same time, in accordance with the terms of the March treaty, Tomaso Morosini (from Venice) was installed as first Latin patriarch of Constantinople, his first task being to crown Baudouin as BAUDOUIN I Emperor of Constantinople[560] at St Sophia 16 May 1204. The constitution which was adopted gave little power to the emperor whose decisions were subject to review by a council of tenants-in-chief which also directed military operations[561]. “Balduinus...imperator...Romanie...Flandrie et Hainonie comes” notified “avunculo suo Gerardo Brugensium preposito ac Flandrie cancellario et...Willelmo castellano Sancti Audomari et Gilleberto Insulensis, baillivis suis de Flandrie” that he had granted land to “Waltero clerico...de Curtraco” at the request of “Robertus de Sperleka” by charter dated Feb 1204 [O.S.] “in palacio nostro Blakerne”, witnessed by “homines mei de Flandria:...Gislebertus de Ipra, Robelote de Waverin...homines nostri de Romania...Cono de Betunia fidelis et consanguineus noster, Gulfridus marescallus Campanie, Milo de Brebant, Manesulus de Insula”[562]. The new patriarch declared the union of the Catholic and Orthodox churches, but the Greek aristocracy in Thrace rebelled. Kalojan Tsar of Bulgaria intervened, defeated Baudouin near Adrianople 14 Apr 1205, and captured and transported him as a prisoner to Bulgaria where he died in prison soon after[563]. When news of Count Baudouin's death reached Flanders in Feb 1206, Philippe II King of France assumed his right as feudal overlord to the wardship of his two daughters[564].
m (Betrothed 1179, 6 Jan 1186) MARIE de Champagne, daughter of HENRI I “le Libéral” Comte de Champagne & his wife Marie de France ([1174]-Jerusalem 9 Aug 1204). The Chronicle of Alberic de Trois-Fontaines names the two daughters of "comitissa Maria Campaniensis" as "Colatiam uxorem comitis Guilelmi Matisconensis et Mariam uxorem comitis Balduini Flandrensis"[565]. The Chronicon Hanoniense records the betrothal in 1179 of "filia comitis Henrici Maria" and "filium [comitis Flandrie] Theobaldum", the latter presumably being an error for "Balduinum"[566]. William of Tyre (Continuator) specifies that the sister of Henri II Comte de Champagne was married to comte Baudouin, later Emperor[567]. The Flandria Generosa names "Maria sorore Theobaldi Campaniæ comitis" wife of Count Baudouin[568]. She visited Palestine in 1204 en route to join her husband in Constantinople, received homage from Bohémond IV Prince of Antioch at Acre[569], but died soon after at Jerusalem. The Flandria Generosa specifies that she died at "Acharon"[570].
Count Baudouin IX of Flanders & his wife had two children:
JEANNE de Flandre (Valenciennes 1200-Marquette near Lille 5 Dec 1244, bur Marquette).
MARGUERITE de Flandre (2 Jun 1202-10 Feb 1280).
Bronnen
[554] Gisleberti Chronicon Hanoniense, MGH SS XXI, p. 519.
[555] Flandria Generosa (Continuatio Bruxellensis), MGH SS IX, p. 326.
[556] Nicholas (1992), p. 75.
[557] Nicholas (1992), p. 75.
[558] Runciman (1978), Vol. 3, p. 101.
[559] Sturdza (1999), p. 477.
[560] His title was Basileus Romaion, the same as borne by his predecessor Emperors of Byzantium, see Sturdza (1999), p. 488.
[561] Runciman (1978), Vol. 3, p. 125.
[562] Courtrai Notre-Dame, XXI, p. 22.
[563] Fine (1994), pp. 81-2.
[564] Nicholas (1992), p. 76.
[565] Chronica Albrici Monachi Trium Fontium 1198, MGH SS XXIII, p. 876.
[566] Gisleberti Chronicon Hanoniense, MGH SS XXI, p. 528.
[567] WTC XXVI.XIV, p. 195.
[568] Flandria Generosa (Continuatio Gislenensis), MGH SS IX, p. 326.
[569] Runciman (1978), Vol. 3, p. 136. According to Sturdza (1999), p. 476, she assumed that she was rejoining her husband in Palestine not knowing of the crusade's diversion to Constantinople and his election as Emperor.
https://fmg.ac/Projects/MedLands/FLANDERS,%20HAINAUT.htm#BaudouinIXdied1205B
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