Which historical figure's actions contributed significantly to the establishment of Buddhism?

Siddhartha Gautama, who is known as the Buddha, played a crucial role in the establishment of Buddhism through his teachings and the philosophy he developed after attaining enlightenment. Born into a royal family in ancient India, he renounced his privileged life in search of a solution to human suffering. The path he followed led him to enlightenment, where he understood the nature of suffering, the concept of the Four Noble Truths, and the Eightfold Path. His insights formed the core teachings of Buddhism, emphasizing principles such as mindfulness, compassion, and the importance of moral conduct.

His life and teachings attracted a following, leading to the establishment of monastic communities and spreading his teachings throughout the region. This foundation paved the way for Buddhism to evolve and spread across Asia and beyond. The other figures mentioned do not have a direct connection to the origins and establishment of Buddhism, making Siddhartha Gautama the pivotal individual in the formation of this major world religion.