Lord Derby was childless and was succeeded in the barony by his first cousin once removed James Murray, 2nd Duke of Atholl, who became the seventh Baron Strange as well. He was the grandson of Lady Amelia Anne Sophia Stanley, daughter of James Stanley, 7th Earl of Derby. On his death the dukedom and barony separated. He was succeeded in the dukedom by his nephew John Murray, 3rd Duke of Atholl, while the barony passed to his daughter Charlotte, the eighth Baroness. She married her first cousin, the third Duke of Atholl. They were both succeeded by their son, the fourth Duke and ninth Baron. In 1786 he was created "Earl Strange" and "Baron Murray of Stanley" in the Peerage of Great Britain. The dukedom and barony remained united until the death of his great-great-grandson, the ninth Duke and fourteenth Baron, in 1957 (see the Duke of Atholl for more detailed information on the holders during this period and for later history of the title).