Calveley's final military engagement was in 1386, when he joined John of Gaunt in an unsuccessful campaign to secure the Castilian throne.

Their family was sustained with large amounts of inbreeding, which led to a series of disputed struggles over rightful claims to the Castilian throne.

King Ferdinand tried to arrive at an agreement with his father wherein he would renounce the Castilian throne.

Isabel succeeded to the Castilian throne in 1474 and Fernando to that of Aragón in 1479.

The early deaths of two children left the third, Princess Juana, heir to the Castilian throne when Isabel died in 1504.

The title was to belong to the official successor of the Castilian throne.

Since 1388, the heir to the Castilian (later Spanish) throne has been styled Prince of Asturias.

Urraca maintained her rule over Zamora following Alfonso's succession to the Castilian throne.

This definitively won him the Castilian throne and the name of Henry II.

Now that she had succeeded in securing her place on the Castilian throne, she could now begin to make the reforms that the kingdom desperately needed.