Who married Alan IV, Duke of Brittany?

Alan IV (c. 1063 – 13 October 1119) was Duke of Brittany from 1072 until his abdication in 1112. He was also Count of Nantes (from c. 1103) and Count of Rennes. His parents were Duchess Hawise and Duke Hoel II. He is also known as Alan Fergant. Through his father, he was of the Breton House of Cornouaille dynasty (Breton: Kerne dynasty). He was the last Breton-speaking Duke of Brittany.

Constance de Normandie (1061/65- 1090), est une fille de Guillaume le Conquérant († 1087), duc de Normandie puis roi d'Angleterre, et de Mathilde de Flandre († 1083).

Ermengarde of Anjou (c. 1068 – 1 June 1146), also known as Ermengarde of Brittany, was a member of the comital House of Anjou and by her two marriages was successively Duchess of Aquitaine and Brittany. She was also a patron of Fontevraud Abbey. Ermengarde was the regent of Brittany during the absence of her spouse, Duke Alan IV of Brittany, from 1096 until 1101.