Charles II and Louis XIV signed a secret treaty, requiring England to aid France in its war against the Dutch Republic and the future conversion of Charles to Catholicism, in return for Louis making large payments to Charles and promising to aid him if there was a rebellion in England.

Charles II was King of Scotland from 1649 until 1651 and King of England, Scotland, and Ireland from the 1660 Restoration of the monarchy until his death in 1685.

Louis XIV, also known as Louis the Great or the Sun King, was King of France from 1643 until his death in 1715. His verified reign of 72 years and 110 days is the longest of any monarch in history. An emblem of the age of absolutism in Europe, Louis XIV's legacy includes French colonial expansion, the conclusion of the Thirty Years' War involving the Habsburgs, and a controlling influence on the style of fine arts and architecture in France, including the transformation of the Palace of Versailles into a center of royal power and politics. Louis XIV's pageantry and opulence helped define the French Baroque style of art and architecture and promoted his image as absolute ruler of France in the early modern period.

The Treaty of Dover, also known as the Secret Treaty of Dover, was an agreement between Louis XIV of France and Charles II of England signed at Dover on 1 June 1670. Officially, it only committed England to provide France with general diplomatic assistance. However, of greater significance were secret provisions which remained largely unknown until published by historians over a century later.

The Franco-Dutch War, 1672 to 1678, was primarily fought by France and the Dutch Republic, with both sides backed at different times by a variety of allies. Related conflicts include the 1672 to 1674 Third Anglo-Dutch War and 1675 to 1679 Scanian War.