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Birth:          ABT 1030 Tonnerre, Bourgogne, France
Death:          BEF 1090 

Notes
heiress of Tonnerre
https://en.wikipedia.org/wiki/Ermengarde_of_Tonnerre
Ermengarde (c. 1032 – 1083), daughter of Renauld, Count of Tonnerre and Herviz,[1] 
she married William I, Count of Nevers[1] in 1045. She had six children:
1.Ermengarde (born 1050, date of death unknown), married Hubert I, Count of 
Beaumont[2]
2.Robert (1052 – February 12, 1095), later Bishop of Auxerre[2]
3.William II (1052–1090), inherited grandfather's title as Count of Tonnerre[2]
4.Heloise (born 1056, date of death unknown), married William, Count of Évreux[2]
5.Sibille (1058–1078), married Hugh I, Duke of Burgundy
6.Renauld II (1059–1097), inherited father's title as Count of Nevers.[2]

Her husband William I was the son of Renauld I, Count of Nevers and Hedwig/Advisa 
of Auxerre,[2] daughter of Robert II of France.[3]

http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jweber&id=I04549
Copied below is a two-part post to SGM, 5 Dec 1998, by the noted French genealogist 
Settipani:

From: SETTIPANI (inapit AT club-internet.fr)
Subject: De NEVERS
Newsgroups: soc.genealogy.medieval
Date: 1998/12/05

The Ascendancy of Ermengarde of Tonnerre : Part I

The question about Nevers has raised up three answers, all of three erroneous. As 
many - if not the most - answers about Early Middle Ages. I will speak thereafter of 
Constantia of Provence (not Toulouse !). Briefly, the problem is that nowhere a 
medieval source or a modern scientific work is invoqued (and I don’t take in 
consideration the triumphant ‘et voilà !’ of my french countryman or his pleasant ‘many 
nights on internet’ or the Stuart, Weiss and so). So, the same mistakes are 
conscenciously repeated. Most of dates are at best conjectural, names are confusing, 
and genealogies dubious or false. The genealogy of the counts of Tonnerre was much 
debatted, notably by E. Petit, M. Chaume, J. Laurent, C. Bouchard, J.-N. Mathieu. I 
give the simplest -and the best- presentation :

1 Ermengardis (Ermengarde), m. Wilhelm (Guillaume, William) of Nevers.
2 Renhard II (Renard), count of Tonnerre ...1002-1039... (b. c. 993, d. c. 1040).
3 Helvisa (Heilwig, Helvise, Heloise), fl. 1018.
4 Milo (Milon) IV, count of Tonnerre ...993..., d. bef. 1002.
5 Ermengardis (Ermengarde), widow of Herbert IV of Vermandois, d. aft. 1018.
8 Milo III, count of Tonnerre ...975-980..., d. c. 987.
9 Engeltrudis (Engeltrude), fl. 980.
16 Wido I (Guy), count of Tonnerre, d.bef. 975 (958 ?).
17 Adela (Adele), widow 975.
32 ? Renhard I, count of Tonnerre ...890-896...
64 Milo II, count of Langres & Tonnerre ...887...
65 Adela, widow 902.

Sources : many nights on Cartularies and ...

no 1 (Gesta Pontif., p. 398-402) ; no 2 (cart. Yonne, no 94 ; E. Petit, Hist. ducs 
Bourg., II, p. 428-9) ; no 3 (E. Petit, II, p. 428-9) ; no 4 (cart. Yonne, no 80, 81, 94) ; 
no 5 (cart. Yonne, no 81) ; no 8 (cart. Yonne, no 76, cart. St-Benoit, no 61) ; no 9 
(cart. Yonne, no 76) ; no 16 (cart. Yonne, no 94, cart. Cluny, II, no 1044 ?) ; no 17 
(cart. St-Benoit, no 61, cart. Cluny, no 625 ?) ; no 32 (Cart. Montieramey, n° 12) ; no 
64 (cart. Yonne, no 94, dipl. Charles III, 887, cart. St-Benigne, no 154) ; no 65 (cart. 
St-Benigne, no 154).

Cartulaire general de l’Yonne, ed. M. Quantin, vol. I, Auxerre, 1854.
Chartes et documents de Saint-Benigne de Dijon, t. II (1943), éd. G.
Chevrier & M. Chaume, t. I (1986), éd. R. Folz & J. Marilier.
Arthur Giry, Documents carolingiens de l’abbaye de Montieramey, Etudes d’histoire du 
moyen age dediees a G. Monod, Paris, 1896, p. 107-136.
Gesta Pontificum Autissiodorensium, ed. M. Duru, Auxerre, 1850.
Recueil des actes de Charles III le Simple, roi de France (893-923), 2 vol., ed. P. 
Lauer, Paris 1940-9.
Recueil des chartes de l’abbaye de de Cluny (802-1300), Paris, 6 vol., 1876-1903, éd. 
A. Bernard et A. Bruel.
Recueil des chartes de l'abbaye de Saint-Benoit-sur-Loire, ed. M. Prou et A. Vidier, 
vol. I, Paris, 1900.

The Ascendancy of Ermengarde of Tonnerre : Part II

The ancestry of Helvisa (no 3) is unknown, but I suppose her a niece of Hardoin, 
bishop of Noyon (1015-1027) (M. Chaume believed she was a sister of his). Hardoin is 
brother of Garnier and son of Robert of Croyes. Probably they are issued of Waltharius 
(Gauthier, Walter), count of Valois, Amiens and Vexin (d. c. 992/8), grandson of the 
caroligian Helvisa.

The family of Ermengardis (no 5), widow of Herbert, not the reverse, is not « Bar-sur-
Seine » (one misunderstanding hypothesis of E. Petit: such a dynasty does not exist at 
this time). She was, I think, the daughter of Alberic II of Macon and his second wife. 
Engeltrudis (no 9) is certainly, as showed by E. Petit, of Brienne family. She was more 
probably the sister (not daughter) of Engelbert I and Gau(s)bert. May be they are the 
nephews of Engeltrudis, viscountess of Chalon and the posterity of Gausbert of 
Nevers, grandson of an Engeltrudis.

The family of Adela (no 17) is not identified. Her name and her granddaughter’s, 
Liedgardis, point to Vermandois. But the name Liedgardis come perhaps via 
Engeltrudis : Engeltrudis of Chalon was probably mother of Liedgardis of Dijon. So, the 
best solution was that of M. Chaume, the countess Adela is the same that Adela, sister 
Leotald of Macon, who make an important donation in 958 for the soul of a Wido, may 
be the count of Tonnerre.

Renard (no 32) is not attested as member of the family. He is named as a count in a 
trial about Tonnerrois and fit at the good place for the missing generation in the family 
(to justify Renard II’s name, wich was no more inherited from a pseudo ‘Bar-sur-Seine’ 
dynasty, and because Milo II’s daughter was a Ren-trude).

Last, Adela (no 65) : if her son was really a Renhard, she was undoubtly the sister of 
Renhard and Manasses I of Auxerre. The family’s origin is Lotharingian.

Bibliography :
C. Bouchard, Sword, Miter, and Cloister. Nobility and the church in Burgundy, 980-
1198, Londres 1987.
M. Chaume, Les origines du duche de Bourgogne, vol. I, Dijon, 1925.
M. Chaume, Recherches d’Histoire Chretienne et medievale, 1947, p.260-277.
J. Laurent, L’origine du comté de bar-sur-Seine, Annales de Bourgogne, (1951), p. 
172-180.
J.-N. Mathieu, Recherches sur les premiers comtes de Tonnerre et de Bar-sur-Seine, 
Bulletin de la société d’archéologie et d’histoire du Tonnerois , 47 (1994), p. 21-29.
E. Petit, Histoire des ducs de Bourgogne de la race capétienne, 6 vol., Paris, 1885-
1898.
C. Settipani, Les origines maternelles du comte de Bourgogne Otte-Guillaume, Annales 
de Bourgogne, 66 (1994), p. 5-63.
C. Settipani, Les comtes d’Anjou et leurs alliances aux Xe et XIe
siècles, dans K.S.B. Keats-Rohan (ed.), Family trees and the Roots of Politics, 
Woodbridge, 1997, p. 211-267.
C. Settipani, Les Widonides : le destin d’une famille aristocratique franque du VIe au 
Xe siècle, memoire de D.E.A., Paris Sorbonne, 1998.

Parents
____ Renaud (ABT  993 - 16 Jul 1039)
DE NOYON Helvise (Erviz) (ABT 1000 - AFT 1030)

Siblings
____ Milo (I) (ABT 1020 - 1046)
DE TONNERRE Ermengarde (ABT 1030 - BEF 1090)

Marriage To ____ William I (ABT 1025 - 20 Jun 1100)
    m.  

Notes
his first

Parents
____ Renaud I (ABT  999 - 29 May 1040)
OF FRANCE Hedwig (ABT 1003 - 1063)

Children by ____ William I ABT 1025 - 20 Jun 1100
DE NEVERS Renaud II (ABT 1046 - 5 Aug 1089)
DE NEVERS William (ABT 1050 - AFT 1090)
DE NEVERS Ermengarde (ABT 1051 - AFT 14 Oct 1090)

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