Re: Zack & Peter Robertson
The connection is very tenuous, but this might be a clue:
Joseph Robertson md Mary (Polly) Bateman on 14 January 1845 in Rockingham Co NC. Her parents were Eleazar Bateman and Lavina Gilley. Lavina was daughter of George Gilley and neice of a Francis Gilley, who witnessed the 1836 will of a James Robertson in Lee Co VA.
I noticed your query because I am looking for the above Joseph, trying to determine whether he was a relative of the above James, who was my ancestor.
It seems to be that there is a little group of Robertsons, Gilleys, and Batemans who indulged in several cousin marriages in the late 1700s and early 1800s, but I haven't been able to sort them all out.