Michael Phelps (200 IM) joins Al Oerter (Discus) and Carl Lewis (Long Jump) as the only people in Olympics history to win the Gold Medal in an individual event 4 Olympics in a row

And he has a chance to join that list again tomorrow with the 100m Butterfly.

And if the title's not clear, the *same individual event

[Wikipedia with updated results](https://en.wikipedia.org/wiki/List_of_multiple_Olympic_gold_medalists_in_one_event)