Charlotte Murray, Duchess of Atholl, the 8th Baroness Strange was a Scottish peer. Born Lady Charlotte Murray, she was the daughter of the 2nd Duke of Atholl. On 23 October 1753, she married her first cousin, John Murray at Dunkeld, Scotland. They had nine children.
She was Lord of Mann (by tradition, the title is "Lord" even if the ruler is female (one later exception was Queen Victoria, who was Lady of Mann).
In 1765, Charlotte Murray sold the suzerainty of the Isle of Man to the British government for £70,000 and an annuity of £2,000. By the passage of the Isle of Man Purchase Act 1765 the title of Lord of Mann was revested into the British Crown. The Act came into force upon the granting of Royal Assent on 10 May 1765.
It has therefore since been used on the Isle of Man to refer to the reigning Monarch of the United Kingdom.