Archie Moore (1916–1998) held the world light heavyweight championship longer than any fighter in history and is the all-time leader in knockout victories with 131 KOs.

Career Highlights

• Professional record: 186 wins, 131 by KO, 23 losses, 10 draws
• Light heavyweight champion from 1952 to 1962
• Knocked down Rocky Marciano — one of only two men to ever floor the undefeated champion

Moore's unorthodox cross-arm defense, ring craft, and pure punching power made him effective well into his 40s. His exact birth year was famously disputed — by Moore himself.

Reference:

Wikipedia: Archie Moore

https://en.wikipedia.org/wiki/Archie_Moore