The Rock beat Mankind to win his first WWE Title at the 1998 King of the Ring pay-per-view. The match was a very physical one, with both men taking a lot of punishment. In the end, The Rock was able to hit Mankind with the Rock Bottom to win the match and the title.
Triple H was a popular wrestler in the late 1990s and early 2000s. He was a member of the D-Generation X stable, and he was known for his arrogant attitude and his in-ring skills. He never faced The Rock for the WWE Title.
Stone Cold Steve Austin was one of the most popular wrestlers in the history of the WWE. He was known for his rebellious attitude and his Stone Cold Stunner finishing move. He faced The Rock for the WWE Title on several occasions, but he never beat him.
Bret Hart was a legendary wrestler who was known for his technical skills and his in-ring storytelling. He was the WWE Champion for a record 5 times. He faced The Rock for the WWE Title at WrestleMania 13, but he lost the match.
In conclusion, The Rock beat Mankind to win his first WWE Title at the 1998 King of the Ring pay-per-view.