The Why We Call Richard Petty “The King” Fact of the Week by Fox Sports:

On Labor Day of 1967, Richard Petty won the Southern 500 at Darlington. It was his third victory on the 1.375-mile oval and his second Darlington win of the season. The win was also the third of what would become a 10-race winning streak and ultimately a 27-win season. By the time 1967 was over, NASCAR sportswriters labeled Petty “The King” … and he’s been The King ever since.( FoxSports )(3-14-2003)