This will be a genealogical account of the family de Brienne. The earliest proven ancestor is one Engelbert III de Brienne, ca 1004-8; m.1st Windemodis __; m.2d Alix, dau.of Cte Renaud de Sens. He left issue:
1.[by 1st m.]Engelbert IV de Brienne; m.Petronille ___
1.1.Gautier I, Comte de Brienne, d.ca 1090; m.Eustachie, Cts de Bar-sur-Seine, dau.of Milon, Cte de Tonnerre et de Bar-sur-Seine
1.1.1.Engelbert de Brienne, a monk at Molesme 1082
1.1.2.Cte Erard I de Brienne, went on Crusade ca 1097, d.1114/25; m.Alix, dau.of Andre de Montdidier, sn de Ramerupt
1.1.2.1.Cte Gautier II de Brienne, sn de Ramerupt, took the cross 1147, d.ca 1161; m.1st a dau.of Andre de Baudement; m.2d N de Soissons, probably dau.of Cte Jean de Soissons; m.3d 1137 Humbeline de Troyes; m.4th 1146 Adelais ___; all kids except Agnes were by 2d wife, and Agnes was by either first or second
1.1.2.1.1.Guy de Brienne, living 1143
1.1.2.1.2.Eustache de Brienne, who may have been ancestor of the Sires de Conflans
1.1.2.1.3.Cte Erard II de Brienne, took the cross 1189, d.1190/1; m.before 1166 Agnes, dau.of Amadeus de Montfaucon, Ct of Moempelgard
1.1.2.1.3.1.Cte Gautier III de Brienne, Pr of Tarento, Pretender to the Sicilian throne, d.in prison 1205; m.Melun 1200 Elvira (d.after 1216) dau.of Cte Tancredo di Lecce, some-time King of Sicily
1.1.2.1.3.1.1.Cte Gautier IV "le Grand" de Brienne, Ct of Jaffa, b.1205, murdered in Cairo ca 1244/7; m.1233 Maria de Lusignan, dau.of King Hugo I of Cyprus
1.1.2.1.3.1.1.1.Cte Jean de Brienne, d.1260/1; m.Marie, Dame de Thieusis, dau.of Sohier d'Enghien, Lord of Zotteghem
1.1.2.1.3.1.1.2.Cte Hugues de Brienne, Cte di Lecce, sn di Conversano, Captain-General of Brindisi, Otranto and Apulia, d.1296; m.1st ca 1270 Isabelle de la Roche-sur-l'Ognon, Lady of Thebes, dau.of Guy, Duke of Athens; m.2d 1291 Helene Komnenedukaine, heiress of Lamia and Larissa (d.1294/5) dau.of Joannes, Archon of Neopatras
1.1.2.1.3.1.1.2.1.[by 1st m.]Cte Gautier V de Brienne et di Lecce, Duke of Athens, etc, k.a.against a Catalonian army nr Thebes 1311; m.before Oct 1305 Jeanne (d.1354) dau.of Gaucher de Chatillon, Cte de Porcien
1.1.2.1.3.1.1.2.1.1.Cte Gautier VI de Brienne, di Lecce e di Conversano, titular Duke of Athens, military commander of Florence, k.a.nr Poitiers 1356; m.1st1325 Margherita, dau. of Philip of Naples, Pr of Tarento; m.2d 1342/3 Jeanne de Brienne (below)
1.1.2.1.3.1.1.2.1.1.1.[by 1st m.]Gautier de Brienne, d.young in Greece
1.1.2.1.3.1.1.2.1.1.2.[by 2d m.]Jeanne de Brienne
1.1.2.1.3.1.1.2.1.1.3.Marguerite de Brienne
1.1.2.1.3.1.1.2.1.2.Isabeau, Cts de Brienne, di Lecce e di Conversano, d.1360; m.ca 1321 Wautier d'Enghien (d.1345)
1.1.2.1.3.1.1.2.2.Agnes de Brienne; m.Cte Jean II de Joigny
1.1.2.1.3.1.1.2.3.[by 2d m.]Jeanne de Brienne; m.Niccolo Sanudo, Duke of Naxos (d.1341)
1.1.2.1.3.1.1.3.Amaury de Brienne, d.ca 1261
1.1.2.1.3.1.2.Marguerite de Brienne, who was seduced by Emperor Friedrich II; later m.Balian, Lord of Sayette
1.1.2.1.3.2.Guillaume de Brienne, d.ca 1200; m.Eustachie, Dame de Pacy (d.after 1235) dau.of Pierre de Courtenay
1.1.2.1.3.2.1.Andre de Brienne, d.ca 1215
1.1.2.1.3.2.2.Elvis de Brienne; m.Jean, Vcte de Saint-Florentin (d.ca 1235)
1.1.2.1.3.3.Andre de Brienne, living 1181
1.1.2.1.3.4.Jean de Brienne; having already been King of Jerusalem between the death of his 1st wife, Queen Maria, in 1212 and the majority of their only child in 1225, in 1229 he became Latin Emperor of Constantinople, after the death of the Emperor Robert (whose heir, Baldwin II, was a child); d.1237; m.1st Tyrus 1210 Maria of Montferrat, Queen of Jerusalem (1191-1212); m.2d before May 1214 Stephanie (d.1219) dau.of King Leon I of Armenia; m.3d Burgos 1224 Infta Berenguela of Castile (d.1198/9)
[by 1st m.]:
1.1.2.1.3.4.1.Queen Yolande=Isabella of Jerusalem (reigned 1225-8); b.1211, d.1228; m.Brindisi 1225 Emperor Friedrich II (d.1250)
[by 2d m.]:
1.1.2.1.3.4.2.John, Crown Prince of Armenia (1216-1220)
[by 3d m.]:
1.1.2.1.3.4.3.Alphonse "d'Acre", Cte d'Eu, d.Tunis of the plague 1270; m.before 1250 Marie, Cts d'Eu (d.1260) dau.of Raoul de Lusignan, Cte d'Eu et de Guines
1.1.2.1.3.4.3.1.Jean I de Brienne, Cte d'Eu, d.1294; m.Beatrix (d.1304) dau.of Guy de Chatillon, Cte de St-Pol
1.1.2.1.3.4.3.1.1.Jean II de Brienne, Cte d'Eu et de Guines, k.a.Kortrijk 1302; m.Jeanne, Cts de Guines (d.1331/2) dau.of Baudoin, chatelain de Bourbourg, sn d'Ardres
1.1.2.1.3.4.3.1.1.1.Raoul I de Brienne, Cte d'Eu, Gov of Languedoc, d.at a tournament in Paris 1344; m.1315 Jeanne, Dame de Lormes et de Chateau-Chinon (d.1351) dau.of Dreux IV de Mello by Jeanne de Toucy
1.1.2.1.3.4.3.1.1.1.1.Raoul II de Brienne, Cte d'Eu et de Guines, beheaded Paris 1350; m.1340 Catherine (d.1388) dau.of Louis of Savoy, Baron de Vaud
1.1.2.1.3.4.3.1.1.1.1.1.[illegitimate] Jean du Bois, sn de la Maison Forte, legitimized 1395
1.1.2.1.3.4.3.1.1.1.2.Jeanne de Brienne, Dame de Chateau-Chinon, d.Sens 1389; m.1st 1342/3 Cte Gautier VI de Brienne (above); m.2d 1357 Louis d'Evreux, Cte d'Etampes (d.1400)
1.1.2.1.3.4.3.1.1.1.3.Marie de Brienne, d.young
1.1.2.1.3.4.3.1.1.2.Marie de Brienne, d.young
1.1.2.1.3.4.3.1.2.Isabelle de Brienne, d.1302/7; m.Jean de Dampierre, Vcte de Troyes (d.ca 1307)
1.1.2.1.3.4.3.1.3.Jeanne de Brienne, d.after 12 Mar 1325; m.1st Raymond, Vcte de Turenne (d.1304); m.2d before 4 Aug 1314 Renauld, Sire de Picquigny, vidame d'Amiens (d.1315)
1.1.2.1.3.4.3.1.4.Marguerite de Brienne, d.1310; m.Guy, Vcte de Thouars (d.1308)
1.1.2.1.3.4.3.1.5.Mahaut de Brienne, living 1328
1.1.2.1.3.4.3.2.Blanche de Brienne, Abbess of Maubuisson, d.ca 1328
1.1.2.1.3.4.4.Louis "d'Acre", d.after 1 Sep 1297 m.Agnes, Vcts de Beaumont, dau.of Raoul VIII, Vcte de Beaumont-au-Maine. Louis then became Vcte de Beaumont-au-Maine himself. For their descendants see Part 2
1.1.2.1.3.4.5.Jean "d'Acre" bouteiller of France, d.1296; m.1st Marie, Dowager Queen of Scotland, dau.of Enguerrand de Coucy; m.2d 1251 Jeanne, Dame de Chateau-du-Loir, dau.of Vcte Geoffroy de Chateaudun
1.1.2.1.3.4.5.1.[by 2d m.]Blanche de Brienne, Dame de Loupelande; m.ca 1266 Guillaume de Fiennes
1.1.2.1.3.4.6.Maria Regent of Constantinople and Namur 1244-5, b.1225, d.in Italy after 5 May 1275; m.Emperor Baldwin II of Constantinople, Mgve of Namur (d.1273)
1.1.2.1.3.5.Ida de Brienne; m.Arnoul de Reynel, sn de Pierrefitte et de Cirey (d.ca 1228)
1.1.2.1.4.Andre de Brienne, sn de Ramerupt, k.a.Acre 1189; m.before 1167 Adelais, Dame de Venisy (d.1221/2) dau.of Anseau de Venisy
1.1.2.1.4.1.Gautier de Brienne, d.young
1.1.2.1.4.2.Erard de Brienne, sn de Ramerupt et de Venisy, Pretender to the comte' of Champagne, d.1245/6; m.1st Helissende, Cts du Perche; m.2d 1213/4 Philippe (d.1250) dau.of Cte Henri II de Champagne
1.1.2.1.4.2.1.[by 1st m.]Andre de Brienne, living 1211
[by 2d m.]:
1.1.2.1.4.2.2.Henri de Brienne, sn de Venisy, d.on Crusade 1249; m.Marguerite (d.1262) dau.of Jean le Sage, Cte de Bourgogne
1.1.2.1.4.2.2.1.Erard de Brienne, sn de Ramerupt et de Venisy; m.Mahaut ___
1.1.2.1.4.2.2.1.1.Beatrix de Brienne, Dame de Venisy et de Turny, d.after1314; m.before 1309 Guillaume de Joinville (d.1314)
1.1.2.1.4.2.2.2.Henri de Brienne, living 1266
1.1.2.1.4.2.3.Erard de Brienne, sn de Ramerupt, k.a.Palestine 1250
1.1.2.1.4.2.4.Marie de Brienne; m.1st Gaucher, Sire de Nanteuil-la-Fosse; m.2d Hugues de Conflans
1.1.2.1.4.2.5.Isabeau de Brienne, d.1274/7; m.before May 1237 Cte Henri de Grandpre (d.1287)
1.1.2.1.4.2.6.Marguerite de Brienne, d.1275; m.Dietrich van Beveren, Burggrave of Dixmuiden (d.1274)
1.1.2.1.4.2.7.Jeanne de Brienne, Dame de Seans-en-Othe; m.before 1250 Mathieu de Montmorency (d.1270)
1.1.2.1.4.2.8.Sibylle de Brienne, Abbess of Ramerupt
1.1.2.1.4.2.9.Alix de Brienne
1.1.2.1.4.3.Elizabeth de Brienne, Dame de Saint-Valerian; m.before 1201 Milon, sn de Pougy (d.ca 1218)
1.1.2.1.4.4.Agnes de Brienne; m.Miles, Sire de Noyers
1.1.2.1.4.5.Ada de Brienne
1.1.2.1.5.Jean de Brienne, Abbot of Beaulieu, d.ca 1192
1.1.2.1.6.Agnes de Brienne, d.after 1191; m.1st before 1138 Jacques, Sire de Chacenay; m.2d Jean de Salmaise, Sire de Chacenay
1.1.2.1.7.Marie de Brienne, living 1152
1.1.2.1.8.Adelais de Brienne, living 1152
1.1.2.1.9.Felicite de Brienne, living 1144
1.1.2.1.10.Elvide de Brienne; m.Barthelmy, Sire de Vignory
1.1.2.2.Guy de Brienne, d.after 22 Jan 1243
1.1.2.3.Felicite de Brienne, d.after 21 Jun 1178; m.1st Simon, sn de Broyes (d.ca 1132); m.2d before 1141 Geoffroi de Joinville (d.1188)
1.1.3.Milon de Brienne, Cte de Bar-sur-Seine, d.ca 1126; m.before 1103 Matilda, dau.of Miles de Noyers
1.1.3.1.Guy de Brienne, Cte de Bar-sur-Seine; m.Petronille-Elizabeth, dau.of Anseric de Chacenay
1.1.3.1.1.Milon de Brienne, Cte de Bar-sur-Seine, d.1151
1.1.3.1.1.1.Petronille, Cts de Bar-sur-Seine; m.1168 Hugues de Puiset, Vcte de Chartres (d.1189)
1.1.3.1.2.Guillaume de Brienne
1.1.3.1.3.Gui de Brienne
1.1.3.1.4.Manasses de Brienne, Cte de Bar-sur-Seine, Bp of Langres, d.1193
1.1.3.1.5.Thibaut de Brienne, Cte de Bar-sur-Seine; m.Marguerite de Salmaise, Dame de Champlost
1.1.3.1.5.1.Perronelle de Brienne, Dame de Champlost, d.1236/7; m.Guy de Chappes (d.1221)
1.1.3.1.5.2.Agnes de Brienne, Dame de Bragelogne, d.ca 1240; m.Philippe de Plancy
1.1.3.1.6.Ermesinde de Brienne; m.1st Anseau de Trainel (d.1188/9); m.2d 1189 (div ca 1195) Ct Theobald I of Bar, Mousson and Luxemburg (d.1214)
1.1.3.2.Renaud de Brienne, Abbot of Citeaux, d.1150
1.1.4.Mantia de Brienne
2.Guy de la Pione
2.1.Lietaud
2.2.Gautier de Ciresio
2.2.1.Gui
2.2.2.Thibaud
3.[by 2d m.]a dau., m.Etienne de Joinville





Part 2
The descendants of Louis d'Acre [de Brienne] and Agnes de Beaumont:
1.Jean de Beaumont, d.1306, bur Etival; m.1st after 26 Sep 1265 Jeanne (d.after 29 Jan 1290) dau.of Geoffroy, sn de la Guerche by Emma, Dame de Chateaugontier; m.2d ca 1305 Marie, Dame de Chantoce, (d.28 Sep 1306, bur Angers) dau.of Walter VII Berthout, sn de Malines, by Marie d'Auvergne; all kids were by 1st m.
1.1.Robert, Vcte de Beaumont, d.28 Sep 1327; m.1st Paris Aug 1299 Marie (d.21 Aug 1322, bur Angers) dau.of Maurice V, Sire de Craon; m.2d 23 Mar 1323 Marie d'Astort; all kids were by 1st m.
1.1.1.Jean, Vcte de Beaumont, b.1302, d.ca 1355, bur l'abbaye de Melinais; m.1st Isabeau, dau.of Jean d'Harcourt by Alix of Brabant; m.2d ca 1330 Marguerite (d.Feb 1380, bur abbaye de Melinais) dau.of Aymar IV de Poitiers, Cte de Valentinois, by Sibylle de Baux
1.1.1.1.[by 1st m.]Jeanne de Beaumont, Dame de Hommet
1.1.1.2.[by 1st m.]Marie de Beaumont, Dame de Beaumont-le-Vicomte, d.1372; m.before 1340 Guillaume de Chamaillart (d.1391); Beaumont-le-Vicomte was inherited by their dau., who m.Pierre de Valois, Cte d'Alencon
1.1.1.3.[by 2d m.]Louis II, Vcte de Beaumont, k.a.nr Cocherel 23 May 1364; m.Lyon 13 Nov 1363 Isabelle (d.1371 bur Notre Dame du Parc), dau.of Jacques de Bourbon, Cte de la Marche
1.1.1.4.[by 2d m.]Geoffroy de Beaumont
1.1.1.5.[by 2d m.]Jeanne de Beaumont, a nun
1.1.1.6.[by 2d m.]Marguerite de Beaumont, d.after 1373; m.Bouchard de Vendome, sn de Feuillet (d.after 6 Mar 1373)
1.1.2.Geoffroy de Beaumont, sn de Lude, d.ca 1355; m.Jeanne, Dame de Beaucay (d.Mar 1402) dau.of Hugues de Beaucay
1.1.3.Guillaume de Beaumont, d.after 11 Mar 1339
1.1.4.Amaury de Beaumont
1.1.5.Marie de Beaumont, Abbess of Bonceray
1.1.6.Jeanne de Beaumont, d.shortly after 23 Oct 1347; m.ca 1331 Jean d'Amboise, sn de Chaumont (d.1346/7)
1.1.7.Marguerite de Beaumont; m.17 May 1338 Bernard I, Cte de Ventadour (d.after 1390)
1.2.Richard de Beaumont
1.3.Isabelle de Beaumont, m.Geoffroy, sn d'Ancenis
1.4.Anne de Beaumont, m.Payen de Chourses
2.Louis de Beaumont, Bp of Durham, d.25 Sep 1333
3.Henry de Beaumont, Lord Beaumont, Earl of Buchan, d.shortly before 10 Mar 1340; m.before 14 Mar 1310 Alice, dau.of Alexander Comyn and niece of John Comyn, Earl of Buchan
3.1.John, 2d Lord Beaumont (1317/8-May 1342); m.before Jun 1337 Eleanor (d.Arundel 11 Jan 1372, bur Lewes) dau.of Henry, Earl of Lancaster & Leicester by Maud de Chaworth
3.1.1.Henry, 3d Lord Beaumont, b.Brabant 1339/40, d.25 Jul 1369, bur Septringham; m.Margaret (d.15 Jun 1398, bur Grey Friars, London) dau.of John de Vere, Earl of Oxford by Joan Badlesmere
3.1.1.1.John, 4th Lord Beaumont, b.1360/1, d.Stirling 9 Sep 1396; m.Catherine (d.1426) dau.of Thomas Everingham
3.1.1.1.1.Henry, 5th Lord Beaumont, b.1379/80, d.Jun 1413; bur Sempringham; m.before Jul 1405 Elizabeth (d.shortly before 12 Nov 1428) dau.of William Willoughby
3.1.1.1.1.1.John, Viscount Beaumont, Cte de Boulogne, Constable and Great Chamberlain of England, k.a.Northampton 10 Jul 1460; m.1st Elizabeth, dau.of William Phelip, Lord Bardolph; m.2d after 1442 Katherine (d.after 1483) dau.of Ralph Neill, Earl of Westmorland, by Joan Beaufort all 3 kids were by 1st m.
3.1.1.1.1.1.1.Henry, d.after 10 Aug 1441
3.1.1.1.1.1.2.William, 2d Viscount Beaumont, d.Wivenhoe 19 Dec 1507, bur there; m.1st before 4 May 1461 (div before 1477) Joan, dau.of Humphrey Stafford, Duke of Buckingham; m.2d 24 Apr 1486 Elizabeth (d.26 June 1537, bur Wivenhoe) dau.of Richard Scrope
3.1.1.1.1.1.3.Joan Beaumont, d. 5 Aug 1466; m.1st John, Lord Lovel (d.1465); m.2d shortly after 11 Nov 1465 Sir William Stanley
3.1.1.1.1.2.Henry Beaumont, who left descendants
3.1.1.1.1.3.Elizabeth Beaumont, d.Jul 1447; m.1st ca 1418 William Deincourt (d.1422); m.2d ca 1427 Sir Richard Hastings (d.1436); m.3d Sir Thomas Neville 
3.1.1.1.2.Thomas Beaumont, left descendants
3.1.1.1.3.Richard Beaumont
3.1.1.1.4.Elizabeth Beaumont; m.before 1411 William, Lord Botreaux (d.ca 1462)
3.1.1.2.Eleanor Beaumont, m.Richard de Molines
3.1.1.3.Catherine Beaumont, m.Sir John Stourton
3.2.Richard Beaumont
3.3.John Beaumont
3.4.Thomas Beaumont
3.5.Elizabeth Beaumont, d.27 Oct 1400; m.ca 1330 Nicholas, Lord Audley
3.6.Catherine, d.11 Nov 1368; m.David, Earl of Athol (d.1335)
3.7.Isabel Beaumont, d.after 24 Mar 1356; m.1st ca 1334 Henry, Earl of Lancaster, Leicester & Derby (d.1361)
3.8.Agnes Beaumont, d.after 1359; m.ca July 1343 Thomas, Lord Lucy (d.1365)
3.9.Joan Beaumont, m.Sir William Fitzwarin