These acts are those of a colloquium organised in 2004 in Caen and Rouen, as part of the celebration of the 800th anniversary of Normandy’s attachment to France. They are part of the renewed interest of the medivists in the Plantagenêt empire and its disappearance, which was not self-evident and a historic issue of major importance for the genesis of modern Europe. They should be seen in the context of another collective work on this issue, published in 2006 s...