A year before his reign as king of Castile and León, Henry II gave Alfonso the lordship of Noreña and as such he appears confirming a charter in November 1368.
One of the stipulations of the treaty was the marriage of Alfonso Enríquez with Isabel of Portugal,[10] a natural daughter of King Ferdinand I, who at that time was about nine years old.
At the end, the King forgave his brother on 18 July 1383 after having imprisoned him in La Puebla de Montalban under the custody of Pedro Tenorio, the archbishop of Toledo.
[14] In September of that year, after the Courts of Segovia, the King donated all of Count Alfonso's properties in Asturias to Gutierre de Toledo, bishop of Oviedo, including the county of Noreña.
[15][16][17] As compensation, King John I granted Alfonso the title of Count of Valencia de Don Juan, a territory that was more accessible and controllable.
The King also granted his son Henry the title of Prince of Asturias, with all the lordships thereby linking this difficult to reach territory — the ideal setting for conspiracies and uprisings due to its isolation and terrain — to the crown.
The King returned her son Henry who had been held hostage and ordered her to leave the kingdom and join her husband, Count Alfonso, who was in France at that time.
[22] Unhappy with the arrangement, Alfonso fled to Avignon to try to convince Pope Gregory XI to intercede on his behalf and to cancel the wedding plans.