Vem daterade Alan II, Duke of Brittany?

Alan II (c. 900–952), nicknamed Wrybeard or Twistedbeard, Alan Varvek in Breton, was Count of Vannes, Poher and Nantes, and Duke of Brittany from 938 to his death. He was the grandson of King Alan the Great by Alan's daughter and her husband Mathuedoï I, Count of Poher. He expelled the Vikings/Norsemen from Brittany after an occupation that lasted from 907 to about 939.