In 1765, Charlotte Murray, Duchess of Atholl, 8th Baroness Strange, sold the suzerainty of the Isle of Mann to the British government. By the passage of the Isle of Man Purchase Act 1765 the title of Lord of Mann was re-vested into the British Crown. It has therefore since been used on the Isle of Man to refer to the reigning Monarch of the United Kingdom.
Traditionally, the style is "Lord" even if the monarch is female; the exception was Queen Victoria, who was styled Lady of Mann.
King Charles III acceded to the throne on 8 September 2022 upon the death of his mother, Queen Elizabeth II, becoming - among other things - the new Lord of Mann.