Treaty of Brussels (1656)

The Treaty of Brussels was an agreement between representatives of Philip IV of Spain and Charles II the leader of the exiled Royalists of England, Ireland and Scotland. It was signed in Brussels, in the Spanish Netherlands, on 2 April 1656 and was signed, on Charles' behalf, by the Earl of Rochester and the Irish leader Ormonde. Alonso de Cárdenas, a former Spanish Ambassador to London, signed on behalf of Philip.

Background
The exiled Royalists had previously been close to the French court, but the 1655 alliance between the English Commonwealth and the Kingdom of France drove them into the arms of France's enemy, Spain.

Terms
In exchange for future Spanish military support for a potential restoration, Charles agreed to raise forces to fight for Spain in the Franco-Spanish War. He also pledged to stop English colonisation in the Americas and return any territory that would be taken by the English Republic from Spain. He also agreed to help help Spain fight Portugal's attempt to regain independence.

Aftermath
In 1657, the English Republic signed the Treaty of Paris with France, which formalised the developing Anglo-French alliance. Charles' alliance with the nation's traditional enemy, Spain, further undermined his support with the English public.

Nonetheless, Royalist supporters joined the Spanish army in large numbers, led by his younger brother James, Duke of York. Large numbers of Irish troops deserted the French army to serve under York in the hope that they could invade England. However, hopes were largely dashed by the Spanish defeat to Anglo-French forces at the 1658 Battle of the Dunes and the surrender of Dunkirk.

Spain then made peace with France at the Treaty of the Pyrenees in 1659, and even the death of Oliver Cromwell did not lead to the immediate collapse of the English Republic.

In 1660, Charles was restored to the crown with the assistance of English troops of the New Model Army, under George Monck. The failure of Spain however to assist Charles' return to London, meant he did not feel himself bound by the treaty and was consequently annulled. Under Charles, English settlement in the Americas continued to grow. In 1662, he made a dynastic marriage with the Portuguese Catharine of Braganza and supported Portugal's successful campaign for independence. The territory that was taken by England from Spain before 1660 was kept or sold.