 The plaque honors those who formed the Washington Monument Society, to construct the Washington Monument in Washington, D.C.He was active in this work during the mid-19th century.In April 1833, Fendall became the assistant secretary to the American Colonization Society in Washington, D.C., a society, which was formed in 1816 by a number of prominent Southern liberals including Francis Scott Key (1779–1843), George Washington Parke Custis (1781–1857), Andrew Jackson (1767–1845), Henry Clay (1777–1852), and ex-president James Monroe (1758–1831).