Alan IV, Duke of Brittany

A traditional rivalry between Brittany and Normandy continued at the close of the 11th century. The Breton-Norman war of 1064–1065 was the result of William the Bastard, Duke of Normandy (later to become known as William the Conqueror) support of rebels in Brittany against Alan's maternal uncle, Conan II.

Conan II died in late 1066 during a campaign in Anjou, and was succeeded by Alan's parents, Conan's sister Hawise and her husband Hoel II. Hoel ruled as regent from Hawise's death in 1072 until Alan reached his majority in 1084.[lower-alpha 1]

To prevent further hostilities during his invasion of England, William I married his daughter Constance to the new duke Alan in 1087.[4] The marriage ceremonies may have taken place in Bayeux in Normandy. William of Malmesbury wrote that Constance was unpopular at the Breton court because of her "severe and conservative" manner. However, Orderic Vitalis wrote that as duchess Constance did all she could to further the welfare of the Bretons, who grieved deeply at her death in 1090.

In 1092 Alan IV donated property to the abbey of Redon by charter, and by 1093 married Ermengarde of Anjou, as a political alliance with Fulk IV of Anjou to counter Anglo-Norman influence.

Redon Abbey, Final resting place of Alan IV

Duke Alan IV's cousin Geoffrey I Boterel (eldest brother of Alan Rufus) died on 24 August 1093 in battle at Dol while in rebellion against the Duke.

Between 1101 and 1104, Alan's younger brother, Count Matthew II of Nantes, died without issue and his county passed to Alan.

Alan IV abdicated as duke in 1112. The former duke retired to the monastery of Redon, where he died in 1119.

In 1098 Alan went on the First Crusade,[5] as part of the army of Robert Curthose, leaving Ermengarde as his regent, and returned in 1101.

Alan IV married Constance in 1087. Constance died in 1090. William of Malmesbury alleges that her husband, Alan, had their servants poison her.[6] They had no children.

Alan's second marriage was to Ermengarde of Anjou in 1093.[4] With Ermengarde he had three children:

• Geoffrey - died young;
• Conan - his successor as Duke of Brittany[4]
• Hawise - she married Count Baldwin VII of Flanders, also known as Hawise Fergant. They divorced and had no issue.

Alan and Ermengarde were separated upon his abdication as duke in 1112.

He had two illegitimate sons, Brian Fitzcount[7] and Guihomar.

Alan IV died in 1119 at the monastery of Redon, where he had retired after his abdication in 1112, and separation from his wife Ermengarde. His only surviving son, Conan III succeeded him.

• Dukes of Brittany family tree

• Bailey, B. Gregory; Bernard, Meaghan E.; Carrier, Gregory; Elliott, Cherise L.; Langdon, John; Leishman, Natalie; Mlynarz, Michal; Mykhed, Oksana; Sidders, Lindsay C. (2008). "Coming of Age and the Family in Medieval England". Journal of Family History. SAGE. 33 (1): 41–60. doi:10.1177/03631990073084492008.CS1 maint: ref=harv (link)
• Everard, J. A. (2004). Brittany and the Angevins: Province and Empire 1158–1203. Cambridge University Press.CS1 maint: ref=harv (link)
• Panton, James (2011). Historical Dictionary of the British Monarchy. Scarecrow Press. ISBN 0810874970.CS1 maint: ref=harv (link)
• Piette, Gwenno (2008). A Concise History of Brittany. University of Wales Press.CS1 maint: ref=harv (link)
• Warren, W. L. (1974). Henry II. University of California Press.CS1 maint: ref=harv (link)

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• http://patp.us/genealogy/conq/richmond.aspx