kingdoms over the first millennia.
On 24 June 1128, the Battle of São Mamede occurred near Guimarães. Afonso Henriques, Count of Portugal, defeated his mother Countess Teresa and her lover Fernão Peres de Trava, thereby establishing himself as sole leader. Afonso Henriques officially declared Portugal's independence when he proclaimed himself king of Portugal on 25 July 1139, after the Battle of Ourique. He was recognized as such in 1143 by King Alfonso VII of León and Castile, and in 1179 by Pope Alexander III.
Afonso Henriques and his successors, aided by military monastic orders, pushed southward to drive out the Moors, as the size of Portugal covered about half of its present area. In 1249, this Reconquista ended with the capture of the Algarve on the southern coast, giving Portugal its present-day borders, with minor exceptions.
In 1348 and 1349, like the rest of Europe, Portugal was devastated by the Black Death.
In 1373, Portugal made an alliance with England, which is the longest-standing alliance in the world.
In 1383, the king of Castile, husband of the daughter of the Portuguese king who had died without a male heir, claimed his throne. An ensuing popular revolt led to the 1383-1385 Crisis. A faction of petty noblemen and commoners, led by John of Aviz (later John I), seconded by General Nuno Álvares Pereira defeated the Castilians in the Battle of Aljubarrota. This celebrated battle is still a symbol of glory and the struggle for independence from neighboring Spain.
Exploration, colonization and trade
In the following decades, Portugal spearheaded the exploration of the world and undertook the Age of Discovery. Infante Dom Henry the Navigator, son of King João I, became the main sponsor and patron of this endeavor.
In 1415, Portugal acquired the first of its overseas colonies by conquering Ceuta. It was the first prosperous Islamic trade center in North Africa. There followed the first
