They were Vikings (or Norsemen, to be precise) who moved to Normandy and started speaking French a generation or so earlier.
Even more so, they moved there on invitation of a French king who gave them the land and their leaders titles in return for them “dissuading” other Vikings from raiding Paris.
Even more so, they moved there on invitation of a French king who gave them the land and their leaders titles in return for them “dissuading” other Vikings from raiding Paris.