Charles I becomes King of England, Scotland and Ireland as well as claiming the title King of France.

Charles I was King of England, Scotland, and Ireland from 27 March 1625 until his execution in 1649.

The monarchy of the United Kingdom, commonly referred to as the British monarchy, is the form of government used by the United Kingdom by which a hereditary monarch reigns as the head of state, with their powers regulated by the British constitution. The term may also refer to the role of the royal family within the UK's broader political structure. The monarch since 8 September 2022 is King Charles III, who ascended the throne on the death of Queen Elizabeth II, his mother.

From 1340, English monarchs, beginning with the Plantagenet king Edward III, claimed to be the rightful kings of France and fought the Hundred Years' War, in part, to enforce their claim. Every English and, later, British monarch from Edward to George III, until 1801, included in their titles king or queen of France. This was despite the English losing the Hundred Years' War by 1453 and failing to secure the crown in several attempted invasions of France over the following seventy years. From the early 16th century, the claim lacked any credible possibility of realisation and faded as a political issue.