Guillaume Poitou, Fierebras

Guillaume Poitou, Fierebras

Male Abt 937 - 994  (57 years)


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  • Name Guillaume Poitou 
    Title Fierebras 
    Nickname "Proud Arm" 
    Birth Abt 937 
    Gender Male 
    Death 3 Feb 994 
    Person ID I9880  footsteps | Ancestors
    Last Modified 27 Apr 2025 

    Father Guillaume d'Aquitaine, Duke D'Aquitaine , III,   b. 26 Dec 910, Poitou-Charentes, France Find all individuals with events at this locationd. 3 Apr 963, Deux-Sevres, France Find all individuals with events at this location (Age 52 years) 
    Mother Adèle de Normandie, Duchess d'Aquitaine ,   b. Abt 900, Normandie, France Find all individuals with events at this locationd. Aft 14 Oct 962, Boulogne, Pays de la Loire, France Find all individuals with events at this location (Age > 62 years) 
    Marriage 1 Jan 935  Normandie, France Find all individuals with events at this location 
    Family ID F3745  Group Sheet  |  Family Chart

    Family Emma of Blois,   b. Abt 940   d. Yes, date unknown 
    Children 
    +1. Guillaume Aquitaine, Duke Of Aquitaine ,   b. 969, Poitou-Charentes, France Find all individuals with events at this locationd. 31 Jan 1030, Pays de la Loire, France Find all individuals with events at this location (Age 61 years)
    Family ID F5372  Group Sheet  |  Family Chart
    Last Modified 21 Apr 2025 

  • Notes 


    • William IV (937 - 3 February 994[1]), called Fierebras or Fierebrace (m e a n i n g "Proud Arm", from the French Fier-à-bras or Fièrebrace, in turn f r o m t h e L atin Ferox brachium), was the Duke of Aquitaine and Count of P o i t o u f rom 963 to his retirement in 990.

      William's father, William III, abdicated to the abbey of Saint-Cyprien i n P o i t i ers and left the government to Fierebras. His mother was Gerloc, t h e d a u g hter of Duke Rollo of Normandy. His sister was Adelaide, wife of H u g h C a p et, the king against whom William later battled for his duchy. H i s e a r l y reign was characterised by many wars. He fought frequently aga i n s t t h e counts of Anjou, the first time against Geoffrey Greymantle, w h o h a d t a ken Loudun.

      In 988, he went to war with the newly elected king of France, Hugh Cape t , w h o m h e refused to recognise. Capet had been granted Aquitaine by Ki n g L o t h air before the latter had been reconciled to William's father. C a p e t r e newed his claim on the great duchy and invaded it that year. A r o y a l a r my was defeated on the plain of the Loire Valley. William shelte r e d t h e y oung Louis, the son of Charles, Duke of Lower Lorraine, the la s t l e g i timate Carolingian heir. He opened the palace of Poitiers to him a n d t r e a ted him as royalty, regarding him as the true heir to the French t h r o n e .

      In 968, he married Emma, daughter of Theobald I of Blois and Luitgarde o f V e r m a ndois.[2] Their marriage was stormy, in part because of William' s i n d u l gence in the pursuit of women and, as a hunting aficionado, wild a n i m a l s. She banished his paramours, they separated twice for long perio d s , a n d f inally he retired to a monastery, as his father had done, leav i n g E m m a to rule Aquitaine in the name of their son William until 1004. T h e i r s e cond son, Ebles, died sometime after 997.

      William IV Fierebras or Fierebrace ("Iron Arm"), Duke of Aquitaine and C o u n t o f P oitou from 963 to his retirement in 990.
      William's father, William III, abdicated to the abbey of Saint-Cyprien i n P o i t i ers and left the government to Fierebras. His mother was Gerloc, t h e d a u g hter of Duke Rollo of Normandy. His sister was Adelaide, wife of H u g h C a p et, the king agains t w hom William later battled for his duchy. H i s e a r l y reign was characterised by many wars. He fought frequently aga i n s t t h e counts of Anjou, the first time against Geoffrey Greymantle, w h o h a d t a ken Loudun.
      In 988, he went to war with the newly-elected king of France, Hugh Cape t , w h o m h e refused to recognise. Capet had been granted Aquitaine by Ki n g L o t h air before the latter had been reconciled to William's father. C a p e t r e newed his claim on the gre a t duchy and invaded it that year. A r o y a l a r my was defeated on the plain of the Loire Valley. William shelte r e d t h e y oung Louis, the son of Charles, Duke of Lower Lorraine, the la s t l e g i timate Carolingian heir. He opened the palace of Poitier s t o h i m a n d t r eated him as royalty, regarding him as the true heir to the Fr e n c h t h rone.
      In 968, he married Emma or Emmeline, daughter of Theobald I of Blois an d L u i t g arde of Vermandois. Their marriage was stormy, in part because o f W i l l i am's indulgence in the pursuit of women and, a hunting aficionad o, w i l d a n imals. She banished his paramours, they separated twice for l ong p e r i o ds, and finally he retired to a monastery, as his father had d one, l e a v i ng Emma to rule Aquitaine in the name of their son William un til 1 0 0 4 . T heir second son, Ebles, died sometime after 997.