Which hero is known for riding Pegasus to defeat the Chimera?

Bellerophon is known for riding Pegasus to defeat the Chimera. In Greek mythology, Bellerophon was a hero favored by the gods, particularly by Athena. Pegasus, the winged horse, was born from the blood of Medusa when she was slain by Perseus. Bellerophon captured Pegasus with the help of a golden bridle given to him by Athena, and together they confronted the fearsome Chimera, a monstrous fire-breathing hybrid creature. Bellerophon's successful defeat of the Chimera solidified his hero status in mythological lore.

The other figures mentioned have their own significant accomplishments. Perseus is renowned for slaying Medusa and also has connections with Pegasus, but he is not associated with the Chimera. Theseus is celebrated for defeating the Minotaur in the Labyrinth, and Heracles is famous for completing the Twelve Labors, which include numerous legendary feats, but neither ride Pegasus nor confront the Chimera. Thus, Bellerophon uniquely stands out as the hero who defeated the Chimera with the aid of Pegasus.