Be23 Agnes, Vicomtesse de Beaumont


was the daughter of Raoul VIII, Vicomte de Beaumont (died about 1238/39)
Be23 Agnes, Vicomtesse de Beaumont
Born:
Died  after 1304
 Will
Married: Louis de Brienne (Be23), son of Jean I de Brienne, Emperor of Constantinople and Berengaria de Castilla, 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
Agnes acceeded as Vicomtesse upon her brother's death, Richard II, vicomte de Beaumont, on 17th September 1242. 
Source: http://www.thepeerage.com/p359.htm#i3585

 .1 She married
     Agnes, Vicomtesse de Beaumont gained the title of Vicomtesse de Beaumont [Maine], suo jure.1
Children of Agnes, Vicomtesse de Beaumont and Louis de Brienne
Marguerite de Brienne d. 9 Apr 13282
Isabel de Brienne d. b 1 Nov 13342
Jeanne de Brienne, Dame de Loue d. 13102
Jean, Vicomte de Beaumont+ b. b 1255, d. a 13052
Marie de Brienne b. b 12632
Louis de Brienne b. b 1263, d. 24 Sep 13332
Sir Henry Beaumont, 1st Earl of Buchan+ b. b 1263, d. b 10 Mar 1339/401
Citations
[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.