b. April 12, 1821, Providence
d. February 14, 1880, Providence
Historian (History of the State of Rhode Island and Providence Plantations (1859-'60)), Lieutenant Governor of Rhode Island (1852-'53, 1861-'62), U.S. Senator (1862-'63), President of the Rhode Island Historical Society (1868-'80).
Arnold was inducted into the Rhode Island Heritage Hall of Fame in 2004.