Chauncey Langdon Knapp was born in Berlin, Vermont, February 26, 1809. He was trained as a printer, and became a newspaperman in Montpelier. For a number of years, he was co-proprietor and editor of the State Journal, Vermont's main Anti-Masonic Party newspaper. Interested in politics, he served as Secretary of State of Vermont from 1836-1843.
In 1843, he visited Lowell, Massachusetts and met poet John Greenleaf Whittier, at the time editor of Lowell's Middlesex Standard (the voice of the Anti-slavery Movement and the Liberty Party). Whittier invited Knapp to stay in Lowell, take over as editor, and continue the fight against slavery and for social reform in Lowell. Knapp accepted and he eventually moved from editor of the Middlesex Standard to editor of the Lowell Citizen and News. He ran unsuccessfully for Congress as a Liberty Party candidate in 1846 and as a member of the Free Soil Party in 1848. Knapp was appointed Clerk of the Massachusetts State Senate in 1851.
In 1854, Knapp ran as an anti-slavery candidate and was elected to the United States House of Representatives. He was identified with the American Party (the only major party with an anti-slavery plank) while serving in the Thirty-fourth Congress.
During the heated slavery debates in Congress, Senator Charles Sumner of Massachusetts was severely beaten by Congressman Preston Brooks of South Carolina on May 22, 1856. In response, Congressmen Knapp delivered his first address on the floor of the House, a speech in which he said his constituents viewed the attack as an "audacious blow hurled at the great right of free opinion. . .the primal element and safeguard of constitutional liberty." 
In 1859, Knapp left Congress and became editor of the Lowell Daily Citizen from 1859-1882.
Death and burial
He died in Lowell on May 31, 1898 and is buried in the Lowell Cemetery.
Knapp Avenue leading from Rogers Street into the Lowell Cemetery is named for him.
- National Endowment for the Humanities, Chronicling America: Historic American Newspapers, Vermont State Journal, retrieved January 4, 2014
- Appendix to the Congressional Globe, 34th Congress, 1st sess., Washington: John C. Rives, 1856, p. 910, July 12, 1856
- United States Congress. "Chauncey L. Knapp (id: K000280)". Biographical Directory of the United States Congress.
- Chauncey L. Knapp at Find a Grave
- Chauncey Langdon Knapp at The Political Graveyard
- Vermont Historical Society, Vermonters in Congress, 1921, pages 120-121
| Secretary of State of Vermont
|U.S. House of Representatives|
| Member of the U.S. House of Representatives
from Massachusetts's 8th congressional district
Charles R. Train
This article incorporates public domain material from the Biographical Directory of the United States Congress website http://bioguide.congress.gov.