American politician (1811–1874) and Massachusetts senator best known as a radical Republican and a staunch opponent of slavery. In 1856, Sumner was severely beaten in the Senate chamber by South Carolina Congressman Preston Brook. ALS, one page, 5 x 8, August 28. Letter to an unknown gentleman. In full: “Agassiz & Longfellow accept the invitation gladly. I enclose a letter from Col. F. which is more confident for Grant than his conversation when I last saw him.—also a 2nd letter from General Smith. I shall be here till sometime next week. Thanks for the note & the enclosure from Codman.” Intersecting folds, one through a single letter of signature, a couple slight brushes to text and signature, and some scattered light toning, otherwise fine condition. RRAuction COA.