woman Luitgarde de Vermandois‏‎, daughter of Herbert II Count of Troyes & Vermandois and Liegarde Princess of France‏.
Born ‎± 920 at Vermandois, Normandy, France, died ‎ Feb 9, 978/79‎, approximately 58 years

Luitgarde de Vermandois, n.i. [no issue with William I of Normandy], killed 942 by Louis, s. of Charles III "the Simple", daughter of Herbert II, Count of Vermandois and Troyes. [Ancestral Roots, Line 121e-19] (As I said 942, is probably talking about her 1st husband William's death. I am disregarding it.)

Luitgarde de Vermandois, d. aft. 978, widow of William I, of Normandy, and daughter of Herbert II de Vermandois. [Ancestral Roots, Line 49-19]

Luitgarde de Vermandois, d. aft. 978; m. (2) 943 Theobald I, "le Tricheur", d. 978, Count of Blois. [Ancestral Roots, Line 136-19]

Note: line 121e does not agree with the other two lines in Luitgarde's death date. I believe that it is in error, maybe referring to William I's death in 942. Also note that Theobald I, Count of Blois, was involved in William I's treachorous ambush and murder in 942 and married Luitgarde, his widow, the next year 943.

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Curt Hofemann, curt_hofemann@yahoo.com, write in a post-em:

The dates are further conflicted by other sources:

birth:
(915/20) [Ref: ES II:79] parenthesis = approximation
915/20 [Ref: ES III:49]
abt 920 [Ref: Moriarty p6, 228]
abt 930 [Ref: Moriarty p36]

married to Guillaume, Duc de Normandie/William "Longsword" Duke of Normandy, Count of Rouen:
um 940 [Ref: ES II:79] (um = about/around)

married to Theobald I 'Le Tricheur' Count of Blois, Seigneur de Montagu:
date: 942/45 [Ref: ES III:49, Moriarty p228]
943/44 [Ref: ES II:46]
943/5 [Ref: Moriarty p36]
abt 945 [Ref: Moriarty p6]

died:
27.V nach 977 [Ref: ES II:79] (nach = after)
27.V nach 978 [Ref: ES III:49]
9.II nach 978 [Ref: ES II:46]
Feb 9 978 [Ref: Moriarty p228, p36]
after Feb 9 978 [Ref: Moriarty p6, Paget p135]

Regards,
Curt

Married ‎before 941 at 1st husband 2nd wife (at least 1 years married) to:

man William I "Longsword" Duke of Normandy‏‎, son of Rollo Rognvaldsson Duke of Normandy and Poppa de Bayeaux‏.
Born ‎± 891 at Rouen, Normandy, France, died ‎ Dec 17, 942 at killed at Picardy, France‎, approximately 51 years, 1st marriage to: Sprota (Sporta) de "@N9064@" Sprota de Senlis, ‎2nd marriage to: Luitgarde de Vermandois

William I, "Longsword", b. ca. 891 probably Rouen, c. 927 succeeded to Duchy of Normandy, c. 930 the Bretons rebelled, he subdued them, taking Brittany, the Channel Islands, the Contentin, and the Averanchin; killed in treacherous ambush 17 Dec 942 by servants of Theobald of Blois and Arnulf of Flanders. He m. (1) (Danish wife) Sprota, a Breton; m. (2) Luitgarde de Vermandois, n.i. [no issue], killed 942 by Louis, son of Charles III "the Simple", daughter of Herbert II, Count of Vermandois and Troyes. [Ancestral Roots]

Note: There is an apparent error in Luitgarde's death date of 942. See notes under her. I think the clause ",killed 942 by Louis, son of Charles III "the simple" belongs to William's death and not to Luitgarde's, even though she is the subject of the sentence before & after the clause. I am going to remove the death date as a sourced alternative. It is an obvious error.

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Assassinated by Arnulf/Arnulph/Arnoul "The Old", Count of Flanders, in 942, according to Encyclopaedia Britannica, 1961 ed., Vol. 16, pg. 493, Article: NORMANDY