Colhoun/Calhoun of South Carolina
The surname was first Colhoun, then changed to Calhoun. John Ewing Colhoun was born 1751 in Virginia and died 26 Oct 1802 at Keowee in Pickens County, South Carolina, buried in the Colhoun Family Cemetery. In 1756 he removed to Long Canes and studied law in Charleston. During the American Revolution he served in the militia and afterwards in 1782 was appointed Commissioner of Forfeited Estates. He was a lawyer, planter, privy councillor, State Legislator and U. S. Senator. He was married in Charleston on 8 Oct 1786 to Floride Bonneau, a daughter of Samuel Bonneau and his wife, Mary Jerman Bonneau. Issue:
- Benjamin Colhoun, born ca 1788 in Charleston, South Carolina,died an infant, buried in the Colhoun Family Cemetery in Pickens County, South Carolina.
- Caroline Colhoun, born ca 1790 in Charleston, South Carolina, died an infant, buried in the Colhoun Family Cemetery in Pickens County, South Carolina.
- William Sheridan Colhoun, born ca 1800 in Charleston, South Carolina, died an infant, buried in the Colhoun Family Cemetery in Pickens County, South Carolina.
- John Ewing Colhoun, born 1791 in Charleston, South Carolina.
- Floride Bonneau Colhoun, born 15 Feb 1792 in Charleston, South Carolina, died 25 Jul 1866 married John C. Calhoun. Their daughter was Anna Maria Colhoun who was married on 13 Nov 1838 Thomas Green Clemson. She died 1853, buried in the Colhoun Family Cemetery in Pickens County, South Carolina.
- James Edward Colhoun.

Fort Hill Plantation was established in 1784 in Keowee, South Carolina by John Ewing Calhoun. The property was sold in 1802 to Rev. James and Elizabeth McElhenney and when he died the property was purchased by Mrs. John Ewing Calhoun who rented it to her son-in-law, John C. Calhoun in 1825, who had removed his family from Washington, D. C.; he became sole owner at the death of Mrs. Calhoun. On November 13, 1838, Anna Maria Calhoun, the daughter of Floride and John C. Calhoun, was married in the parlor to Thomas Green Clemson. When John C. Calhoun died on 31 March 1850 in Washington, D. C. (buried at St. Philip's Episcopal Church in Charleston), Floride Calhoun sold the plantation to her eldest son, Andrew Calhoun.