 Gaunt's sudden decision only a few days later to abandon his plans and return to England Charles took as a personal betrayal.In order to placate the Castilian King he now agreed for his eldest son, the future Charles III of Navarre, to marry Henry of Trastámara's daughter Leonora in May 1375.In 1377 he proposed to the English that he would return to Normandy and put the harbours and castles he still controlled there at their disposal for a joint attack on France; he also proposed that his daughter should be married to the new English King, the young Richard II.