However, English aid to Portugal went back much further to the 1147 Siege of Lisbon, when English and other northern European crusaders – en route to the Holy Land to participate in the Second Crusade – stopped and helped Portuguese King Afonso Henriques to conquer the city from the Moors.

As a result, Portugal and England were on opposite sides of the Anglo-Spanish War (1585–1604) and the Dutch–Portuguese War.

The alliance was reconfirmed after the Portuguese Restoration War and the English Restoration.

Her personal qualities were of the highest standard, and she reformed the court and imposed rigid standards of moral behaviour.

On the other hand, the more tolerant Portuguese aristocracy saw her methods as too traditional or outdated.

The most important part of the treaty stated that: It is cordially agreed that if, in time to come, one of the kings or his heir shall need the support of the other, or his help, and in order to get such assistance applies to his ally in lawful manner, the ally shall be bound to give aid and succour to the other, so far as he is able (without any deceit, fraud, or pretence) to the extent required by the danger to his ally’s realms, lands, domains, and subjects; and he shall be firmly bound by these present alliances to do this.

In July 1386, John of Gaunt, Duke of Lancaster, son of the late king Edward III of England and father of the future King Henry IV of England, landed in Galicia with an expeditionary force to press his claim to the Crown of Castile with Portuguese aid.

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This alliance, which goes back to the Middle Ages, has served both countries.

It was very important throughout history, influencing the participation of the United Kingdom in the Iberian Peninsular War, the UK's major land contribution to the Napoleonic Wars and the establishment of an Anglo-American base in Portugal.

The alliance was reconfirmed after the breakup of the Iberian Union, primarily due to both countries' respective rivalries with Spain, the Netherlands, and France, both in Europe and overseas.