According to the 1939 article by Claude A. Thompson on the New London Museum website www.newlondonmuseum.org
Samuel Clemens and Pamela Goggin were married in Bedford County on Oct 23,1797. They lived in Campbell County. Their first child was John Marshall Clemens, the father of Samuel Clemens/Mark Twain.
Samuel Clemens evidently came to Campbell from Surry County on the lower James River. Surry County records show the will of John Clemens, May 2, 1710 whose wife was Mary and children Samuel, John and Anne. Will mentions a brother William. William's will mentions wife Ales (Alice?) and their five children:Lucy, Elizabeth, Samuel, William and Henry.
I hope that this may be of some help. Mike Beard