Samuel Thomas Alston (1806-1860) was the owner of Tusculum Plantation, which he had built in 1830 in Arcola, Warren Co. He was married to Ruina Temperance Williams (1814-1897) dau/of Robert Webb Williams (1792-1822) & Hartwell Hodges Davis (1793-1870) who early on, owned Vine Hill Plantation in what is now Centreville, Franklin Co., which later went to their youngest son, Archibald Davis Williams (1821-1904). Over the years, Samuel's family, including his father, Samuel (1770-1807), his mother, Elizabeth Faulcon (1775-1848), and most of his siblings, many of whom died in Warren Co., left wills that included the bequests of many slaves. If you haven't done so already, I would urge you to get copies of their estate records where they filed an inventory of their slaves, and a distribution of said "property". I don't see any Leroy in the will abstracts of these individuals, but that doesn't mean anything since most of the families had many more slaves which would only have been listed in a slave inventory. A slave inventory can include more info about the slaves and can even list the mother and other family members, so I would start with last Alston in that family who died during slavery times, who I believe was Samuel T. Alston (he left all of his property to his wife), and work your way back.
If you're not sure what a slave inventory may look like, you can check out an example of the transcribed copy to which I posted a link to here in the Slave Forum in a message about the slaves of Peter R. Davis, d. 1850.

Deloris