While King Enrique was in that township [of Santo Domingo de la Calzada], he sent word to the King of Navarre, telling him to give up the towns of Vitoria and Logroño, which belonged to him; if not, he would make war on him. The King of Navarre said that he would put the matter in the hands of Cardinal Guy of Boulogne, who was in Castile at the time. When it was submitted for his judgement, it was decided that the towns should be returned to King Enrique, and that Prince Carlos, the first-born son of the King of Navarre, should marry Princess Leonor, the daughter of King Enrique, who was at one time to be the wife of King Fernando, as had been agreed between the kings in the Treaty of Alcoutim. The King of Castile met with the King of Navarre in a town called Briones, and they became good friends.

The King of Navarre told King Enrique that the King of England and the Prince of Wales wanted to be his friends, provided that he left his alliance with France, and also provided that he gave the prince a certain sum of money in partial payment of the debt owed to the prince by his brother King Pedro [of Castile] for the expenses and salary incurred when he had gone to war with him along with other lords at his own expense. In this way, the king and the prince would give up their other claims on Castile, as would the Duke of Lancaster, who was married to Princess Constanza, the daughter of King Pedro. King Enrique told the King of Navarre that he thanked him for his good intentions, but that there was no way that he would abandon his alliance with France; however, if peace was made between the King of France and the King of England, he would satisfy the prince and the duke with a certain sum, so that they would drop the claim which they were trying to make concerning King Pedro. The King of Navarre said that the peace between France and England was still to be negotiated, but that there were in this matter many doubts and debatable points, and that he did not know if they could be resolved.