Anglo-Portuguese Treaty of Windsor: the oldest active treaty in the world

Anglo-Luso Treaty: established the right to English burial grounds in Portugal

Second Treaty of San Ildefonso

Spain and France join forces against the British Empire.
Portugal refuses to comply with Napoleon's embargo on trade with Britain.

British defeat Spanish fleet at Cape St.Vincent, Portugal

War of the Oranges

French and Spanish troops invade Portugal
Spain seizes Olivença
Peace of Badajoz: Portugal agrees to close its ports to Britain

One year of peace between Britain and France 1792-1815

Britain declares war on France 18 May 1803

Spain joins France against Britain and allied forces

Nelson defeats Spanish and French fleets at Cape Trafalgar Portugal restores relations with Britain

Continental System

Embargo on trade with Britain. Portugal refuses to comply; therefore is subject to annexation by France