In 1696, he was appointed envoy extraordinary to London, where he participated in important negotiations related to the Portuguese intervention in the
War of the Spanish Succession, the most complex political event of the time. In 1712, along with the Count of Tarouca, he represented Portuguese interests in the
Congress of Utrecht. By April 1712, da Cunha had left his post. After the signing of the Treaty of Utrecht, 1715, he returned to London as envoy extraordinary, by request of the newly crowned King
George I of Great Britain. By 1719, da Cunha had left his post once again. Then he was sent to
Madrid, then ruled by
Giulio Alberoni, with whom he had several disputes. Subsequently, he was appointed Minister Plenipotentiary to the Congress of Cambray, which ended up not taking place. Cunha remained in Paris, where he was forced to retire due to a disagreement with Ambassador Livry, envoy of France to Lisbon. Cunha went to
Brussels, where he reached an agreement with the Marquis of Fenelon, French minister to
The Hague, and returned to Paris, where he remained as envoy extraordinary of Portugal to the French court, until his death. == Ideas ==