Spencer C Griffin is my 3rd gr grandfather. This is the information I have, but I do not have the documentation.
Spencer Cyrus Griffin was born abt. 1783 and is the son of William Griffin who was born 29 Jan 1742 in Richmond VA and died 11 Feb 1793 in Mecklenberg VA. He married Susanna Chiswell in 1771 in VA. She was born abt. 1745 in Virginia and died abt. 1805 in Pleasant Hill VA.
William Griffin is the son of Leroy Griffin born 9 Jan 1711 in North Farnham Parish VA and died in 1750 in Richmond VA. He married Mary A Bertrand on 5 Oct 1734 in Lancaster VA. She was born abt. 1717 in Lancaster VA and died abt 1759 in Richmond VA.
William Griffin had a notable brother (Spencer's uncle), Judge Cyrus Griffin. Judge Griffin was the last president of the Continental Congress.http://en.wikipedia.org/wiki/Cyrus_Griffin
Hope this helps.