Have you found any more on your William Thomas Allen?If not, do you think he might be the son of Hiram Allen b. ca 1796 SC moved to Jackson Co. Ga after 1830 before 1840. Hiram had several sons, who, I don't have names for.They would have been born between 1820-1840.One son of Hiram Allen, Isom B. Allen named a son William Thomas Allen (b. 1859 Jackson Co. GA.
Hiram Allen is on the 1850 Jackson Co. GA census.He is not on the 1860, only his son, Isom B. Allen and family are still in Jackson Co. GA.
Hiram is found on the 1860 Floyd Co. Ga census from what another researcher has told me.Hiram is then found on the 1870 and 1880 Talladega Co. AL census.
If you think your William T. Allen might be connected to Hiram email me at firstname.lastname@example.org and I will be glad to share with you what I and several others of this line have put together so far.