There were at least 3 white Burt families in Halifax County for the 1790 census (pages 61 and 63 in the printed census).
A Lucy Burt was in a list of "Free Negroes and Mulattoes above the age of 16" in Norfolk City in 1813.
For the 1830 Halifax County census the following "free colored" families headed households:
Phereby Burt -00001 p.323 (36-55 years of age)
Aggy Burt 1-00001 p.323
Rhodam Burt 011-11 p.293
Stephen 01- p.311
As well as the Richardsons, the family married members of the free African American Scott family of Halifax.
Paul