I have Google Doc full of names
Your cited example of Justus Angel who owned 84 slaves is addressed by Koger in his endnotes who has determined that many of the Black and mulatto slaveowners listed in Woodson's work are 100% White:
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18. Woodson, 'Free Negro Owners of Slaves', pp. 30-31 (The following persons were reported to be free black slaveholders by Carter G. Woodson but were actually white absentee slaveowners: 1. Frances C. Dalton was a native of England and the wife of Dr. James Dalton. When Mrs. Dalton died in 1846, she was buried in the graveyard of St. Michael's Church, which was a segregated cemetery. — Clara Jervey, ed., Inscriptions of the Tablets and Gravestones in St. Michael's Church and Church yard Charleston, S.C. (Columbia: State Company, 1906), p. 85. 2. Mistress Lucretia Horry of St. Bartholomews Parish was recorded as white on the 1820 census and listed as a white resident of Charleston City by the local directory. -Fourth Census of the United States, 1820: Schedule I, St. Bartholomews Parish, Colleton County, South Carolina, p. 48; Porcher, Directory for 1831, p. 82. 3. Henry Johnson was listed as a white man in the census of 1810. — Third Census of the United States, 1810: Schedule 1, St. Paul's Parish, Colleton County, South Carolina, p. 606. 4. John D. Legare was reported to be a white citizen by the city directory. —Supplement of Charleston Directory for 1836 (Charleston: Dowling, 1836), p. 52. 5. Ephraim Mikell Seabrook was of English ancestry according to Mabel L. Webber. —Mabel L. Webber, "The Early Generations of the Seabrook Family," South Carolina Historical & Genealogical Magazine vol. 17 (January 1916), pp. 63, 67.
The other white slaveowners classified as free persons of color were Justine Angel, Martha Ann Mathews, Margaret Stock, Charles Tennent, Nicholas Venning, Robert Yenning, and Daniel J. Warring."
ibid., pg. 23
Black Slaveowners - Free Black Slave Masters in South Carolina, 1790-1860, Larry Koger, pg. 6.
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