Answer
Yes, Floyd Patterson regained his title after losing it. He first won the title in 1956, when he was just 21 years old. He then lost the title to Ingemar Johansson in 1959. But Patterson won the title back in 1960, when he defeated Johansson in a rematch. Patterson then lost the title again in 1962, when he was defeated by Sonny Liston. He retired from boxing in 1972.