Mann was born in
Gloucester County, Virginia, the eldest son of
Mann Page I, a member of the
Virginia Governor's Council, and his second wife, Judith Carter (daughter of
King Carter, who also served on that council, also known as the Council of State). His first wife was Alice Grymes Page (daughter of
John Grymes), and his second wife was Ann Corbin Tayloe (daughter of
John Tayloe I). He was descended from Colonel
John Page, who emigrated from Middlesex County in England to Bruton Parish in what was known as
Middle Plantation but became
Williamsburg in the
Colony of Virginia circa 1650. and later attended the
College of William & Mary, where he was a classmate and friend of
Thomas Jefferson. ==Career and death==