High Quality Content by WIKIPEDIA articles! Alan IV (died 13 October 1119) was Duke of Brittany, from 1084 until his abdication in 1112. He was also Count of Nantes and Count of Rennes. He was son of Hawise, Duchess of Brittany and Duke Hoel II. He was known as Alan Fergant, which in Breton means "Alan the Strong". Through his father, he was of the Cornwall dynasty (Breton: Kerne dynasty).