Be23 Louis de Brienne

Be23 Louis de Brienne was born the son of Jean I de Brienne, Emperor of Constantinople and Berengaria de Castilla.
Born: before 1237 ?c 1190.
Died after 1263.
Married:  Agnes, Vicomtesse de Beaumont, daughter of Raoul VIII, Vicomte de Beaumont, before 1253.
Children of Louis de Brienne and Agnes, Vicomtesse de Beaumont
Be22-1 Marguerite de Brienne d. 9 Apr 1328, married Bohemund VII, Prince of Antioch and Count of Tripoli.
Be22-2 Isabel de Brienne d. b 1 Nov 1334, married John de Vesci, Baron Alnwick, son of William de Vesci and Agnes Ferrers, d.s.p.
Be22-3 Jeanne de Brienne, Dame de Loue d. 1310, married on 11th November 1286 Guy VIII de Montmorency, Comte de Caserta, son of Guy VII de Laval and Philippa de Bretagne, Dame de Vitre.
Be22-4 Jean, Vicomte de Beaumont, b. b 1255, d. a 1305
Be22-5 Marie de Brienne b. b 1263
Be22-6 Louis de Brienne b. b 1263, d. 24 Sep 1333
Be22 Sir Henry Beaumont, 1st Earl of Buchan b. b 1263, d. b 10 Mar 1339/40
 Louis de Brienne was also known as Louis d'Acre.1 As a result of his marriage, Louis de Brienne was styled as Vicomte de Beaumont-au-Maine, jure uxoris. 
Stirnet pedigree

[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.
[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.