Cassius Marcellus Clay
Cassius Marcellus Clay (October 9, 1810 – July 22, 1903) was an American planter, politician, military officer and abolitionist who served as the United States ambassador to Russia from 1863 to 1869. Born in Kentucky to a wealthy planter family, Clay entered politics during the 1830s and grew to support the abolitionist cause in the U.S., drawing ire from fellow Southerners.