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Birth:          ABT 1115 
Death:          AFT 1155 

Notes
https://en.wikipedia.org/wiki/Bertha,_Duchess_of_Brittany
Bertha of Cornouaille ( fl. 1125-55), also known as Bertha of Brittany (Breton: Berthe 
Breizh), was hereditary Duchess of Brittany between 1148 until her death[1] and 
Dowager Countess of Richmond. Bertha was the eldest daughter of Conan III of 
Brittany by Maude, the illegitimate daughter of King Henry I of England.[1] She was 
the last member of the Breton House of Cornouaille to reign over Brittany.
Life[edit]

Bertha was the daughter of Duke Conan III of Brittany. She married the son of 
Stephen of Treguier, Alan the Black and she lived in England with Alan until his death 
in 1146. Alan would eventually become Earl of Richmond. After Alan's death she 
returned to Brittany as Dowager Countess of Richmond and eventually married Odo, 
Viscount of Porhoet. When her father Duke Conan III died, on his deathbed Conan III 
renounced Bertha's brother Hočl as heir, [a] and designated Bertha as his heiress. On 
Conan III's death she became hereditary Duchess of Brittany. [b][1]

Family[edit]

In her first marriage, by 1138, Bertha was married to Alan le Noir [c] Bertha and Alan 
had three children:
Conan IV, Duke of Brittany, b. 1138, their son and heir, as Duke of Brittany and Earl 
of Richmond
Constance, who married Alan III, Vicomte of Rohan
Enougen, abbess of St. Sulpice

Bertha married her second husband, Odo, Viscount of Porhoet in about 1148.[1] 
Bertha and Odo had three children:
Geoffroy.[3]
Adelaide[3] (died in 1220), Abbess of Fontevrault
Alix,[4] mistress of Henry II, King of England

Succession[edit]

Bertha died between 1158 and 1164, and with her death the ducal throne passed to 
her son Conan. [d]

Parents
____ Conan III "le Gross" (ABT 1092 - 17 Sep 1148)
____ Maud (ABT 1091 - )

Siblings
OF BRITTANY Bertha (ABT 1115 - AFT 1155)

Marriage To DE BRITTANY Alan (ABT 1098 - 15 Sep 1146)
    m.  

Notes

Parents
____ Stephen (ABT 1060 - 21 Apr 1136)
OF GUINGAMP Hawise (1072 - AFT 1135)

Children by DE BRITTANY Alan ABT 1098 - 15 Sep 1146
____ Conan IV (1138 - 20 Feb 1171)

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