Alliance of Castile and Portugal

Name: Alliance of Castile and Portugal
Start: 1328
End: 1340

Type Event Region Iberia Time 1328–1340

In the 1330s a diplomatic crisis over Alfonso XI's mistress Leonor de Guzmán strained ties with Portugal, resolved by the 1340 Treaty of Seville form…

Timeline

1328Castile · CastileIn 1328 Castile's Alfonso XI married Maria, daughter of Portugal's Alfonso IV, consolidating royal ties between the two kingdoms and laying political groundwork for later joint resistance to Muslim powers.
1335Évora · PortugalIn 1335, because Alfonso XI neglected Queen Maria in favor of his mistress Leonor de Guzmán, Maria returned to her father Alfonso IV's court at Évora. The Portuguese king demanded the Castilian king separate from his mistress, applying pressure together with the pope and Muslim powers.
1340Seville · AndalusiaIn July 1340, under the Treaty of Seville, Alfonso XI agreed to confine Leonor de Guzmán to a convent in exchange for military support from Portugal's Alfonso IV. The allied forces then defeated the Marinid–Granadan coalition at the Battle of Salado.

Sources

Maria of Portugal, Queen of Castile https://en.wikipedia.org/wiki/Maria_of_Portugal,_Queen_of_Castile
Alfonso XI of Castile https://en.wikipedia.org/wiki/Alfonso_XI_of_Castile
Battle of Río Salado https://en.wikipedia.org/wiki/Battle_of_R%C3%ADo_Salado