John Carteret, Earl Granville, was born on April 22, 1690, to George Carteret, Baron Carteret, and his wife, Grace Granville. After inheriting his father's baronetcy and attending Westminster School and Oxford's Christ Church College, he entered the House of Lords in 1711. He held several additional appointments, including ambassador to Sweden (1719-1720), secretary of state for the southern department (1721-1724), lord lieutenant of Ireland (1724-1730), secretary of state for the northern department (1742-1744), and lord president of the council (1751-1763). He married Frances Worsley in 1710 and they had several children. Following Frances's death in 1743, he married Sophia Fermor; they had one daughter before Sophia's death in 1745.
John Carteret claimed vast tracts of land in the province of North Carolina, though he became involved in a dispute with Henry McCulloh over ownership claims in the 1750s. The men agreed to an arrangement in 1755, but continued to debate its provisions into the following decade. John Carteret, Earl Granville, died on January 2, 1763.
See Howard H. Peckham's Guide to the Manuscript Collections in the William L. Clements Library (Ann Arbor: University of Michigan Press, 1942), for additional information about this collection.