Rocky Balboa is loosely based on this American former professional boxer who fought at heavyweight ans was born in what year
Chuck Wepner Charles "Chuck" Wepner (born February 26, 1939) is an American former professional boxer who fought at heavyweight. As a world ranked contender he fell just seconds short of a full fifteen rounds with world heavyweight champion Muhammad Ali in a 1975 title fight. Wepner also scored notable wins over Randy Neumann and Ernie Terrell.
Rocky Castellani Attilio N. "Rocky" Castellani (May 26, 1926 – August 31, 2008) was an American boxer. He was born in Luzerne County, Pennsylvania, to Attilio Castellani (1889–1974) and Rose Isopi Castellani (1896–1938), who later moved to Margate City, formerly South Atlantic City, in Atlantic County in eastern New Jersey. He fought in the battle of Iwo Jima during World War II as a Marine. He boxed in the Marine Corps and won the title of "Champion of All China and Guam".