Be24 Jean I de Brienne

Be24 Jean I de Brienne, Emperor of Constantinople was the son of Erard II, Comte de Brienne and Agnes de Montfaucon.
Born:  circa 1148.
Married: firstly, Maria de Montferrat, Queen of Jerusalem, daughter of Conrad, Marquis de Montferrat and Isabella d'Anjou, Queen of Jerusalem, on 15 September 1210.
secondly, Stephania of Armenia, daughter of Leo II, King of Armenia, in 1214.
thirdly, Berengaria de Castilla, daughter of Alfonso IX, Rey de Castilla y León and Berengaria de Castilla, in 1223. 
Died on 21 March 1237.
Died o
Child of Jean I de Brienne, Emperor of Constantinople and Maria de Montferrat, Queen of Jerusalem
(Be23-1) Isabel de Brienne, Queen of Jerusalem+ b. c 1212, d. 30 Apr 1228.

Children of Jean I de Brienne, Emperor of Constantinople and Berengaria de Castilla
(Be23-2) Alphonse, Comte d'Eu+ d. 25 Aug 1270
(Be23-3) Marie de Brienne+ b. 1225, d. a 5 May 1275 
(Be23) Louis de Brienne, b. b 1237, d. a 1263 

Jean I de Brienne, Emperor of Constantinople fought in the Third Crusade.1 He gained the title of King John of Jerusalem.2 Between 1205 and 1221 he was the Regent of the County of Brienne for his nephew.1 He succeeded to the title of King Jean I of Jerusalem in 1210, in right of his wife, although he reigned at Acre as Jerusalem was in Saracen hands.1 He abdicated as King of Jerusalem in 1212.3 He fought in the Fifth Crusade from 1218 to 1219, which he led.1 He was created Emperor Jean I of Constantinople in 1229.1 He was a Franciscan friar. 

[S8] Charles Mosley, editor, Burke's Peerage and Baronetage, 106th edition, 2 volumes (Crans, Switzerland: Burke's Peerage (Genealogical Books) Ltd, 1999), volume 1, page 227. Hereinafter cited as Burke's Peerage and Baronetage, 106th edition.
[S16] Jirí Louda and Michael MacLagan, Lines of Succession: Heraldry of the Royal Families of Europe, 2nd edition (London, U.K.: Little, Brown and Company, 1999), table 113. Hereinafter cited as Lines of Succession.
[S38] John Morby, Dynasties of the World: a chronological and genealogical handbook (Oxford, Oxfordshire, U.K.: Oxford University Press, 1989), page 172. Hereinafter cited as Dynasties of the World.
[S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 59. Hereinafter cited as The Complete Peerage.