Looking for Info on Robert and Rachel Clark of Eagle Township Vinton County Ohio

I have traced my Clark lineage to Robert Clark who entered into Eagle Township between 1800 and 1812. He and his wife Rachel Graves are said to be both from North Carolina. I am trying to locate where in North Carolina did they come from. I know that Rachel was born on Chatham County, North Carolina around 1772, her parents were William and Emmy (Mode) Graves. Any help would be appreciated. Thanks !!