Well, over a year later I found this post from so long ago. I still have not been able to find anything past William Shrieves, but I haven't really been working on genealogy a lot lately, either. I think it's going to take someone more dedicated than myself to go further - wondering if perhaps he came over from England and the search should continue there, or if he moved from somewhere else no one is aware of.
Anyway - noticed your username is spelled Shreaves. Do you have any idea where the split happened between the Shrieves and Shreaves? I saw tons of gravesites in Parksley for Shreaves when I was there 10 years ago, and have always wondered about the difference in spelling.