Horatio_Seymour_(Vermont_politician)--Thomas_Harkin

Horatio Seymour (May 31, 1778 – November 21, 1857) was a United States senator from Vermont. He was the uncle of Origen S. Seymour and the great-uncle of Origen's son Edward W. Seymour.
Horatio Seymour's brother Henry became a resident of Utica, New York and was the father of Horatio Seymour, who served as Governor of New York, and of Julia Catherine Seymour, the wife of Senator Roscoe Conkling.