Who had his medals reinstated in 1983, 30 years after his death, after they were taken away at Stockholm in 1912?

Question

After Canadian sprinter Ben Johnson won the 100 metre dash at the 1988 Seoul Olympics, why was his gold medal taken away and awarded to runner-up Carl Lewis?

Answer 1

Jim Thorpe
Thorpe originally lost his Olympic titles after it was found he was paid for playing two seasons of semi-professional baseball before competing in the Olympics, thus violating the amateurism rules that were then in place.