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The monarchy of Saint Lucia (the Saint Lucian monarchy) is a system of government in which a hereditary, constitutional monarch (shared with other countries of the Commonwealth) is the sovereign of Saint Lucia. The King's constitutional roles are mostly delegated to the Governor-General of Saint Lucia.
Royal succession is governed by the English Act of Settlement of 1701, which is part of constitutional law.
King Charles III acceded to the throne on 8 September 2022 upon the death of his mother, Queen Elizabeth II, becoming the Head of State of a number of realms of the Crown, including Saint Lucia.
In Saint Lucia King Charles III is styled: "His Majesty Charles the Third, by the Grace of God, King of Saint Lucia and of His other Realms and Territories, Head of the Commonwealth" (thus omitting the "Defender of the Faith" title used in the United Kingdom and some other realms).
The monarch, besides reigning in Saint Lucia, separately serves as monarch for a number of other Commonwealth countries known as Commonwealth realms. This developed from the former colonial relationship of these countries to Great Britain, but they are now independent of each other and are legally distinct. | 
