He played a key role in spreading of Buddhism across ancient Asia
Ashoka, one of history's most powerful Emperors, was instrumental in spreading Gautama Buddha's message throughout the world. He not only adopted Buddhist ideas into his rule, but he also encouraged Buddhist expansion by sending monks to countries such as Greece, Burma, Nepal, Tibet, Central Asia, China, and Japan. Around 250 BCE, Moggaliputta-Tissa (a Buddhist monk from Patliputra) was patronized by Ashoka and sent out nine Buddhist missions to propagate Buddhism in the "boundary areas," according to Sri Lankan legend. By sending emissaries to five monarchs and several other kingdoms, Ashoka secured a "dhamma triumph," according to the Rock Edict XIII. He also dispatched Sanghamitra, his only daughter, and Mahindra, his only son, to spread Buddhism in Sri Lanka, where it is now an important religion.
Ashoka's support and sponsorship of Buddhism had far-reaching ramifications, as seen by the religious and spiritual histories of various countries, particularly in Asia. Traditional Buddhist practices and philosophies evolved over time, becoming regionally diverse. Ashoka also established several shrines and monasteries in his efforts to spread Buddhism, as well as inscribed Buddhist teachings on rocks and pillars in various locations. This is considered to be one of the major achievements of Ashoka the great.
It's also worth noting that, in keeping with the Dharmic family of religions (Indian origins), despite Ashoka's zealous beliefs, there's no evidence that he was biased against anyone. The Rock Edicts 6, 7, and 12 are among Ashoka's edicts that emphasize tolerance of all sects. Ashoka honors individuals of all faiths in his Rock Edict 12. Ashoka dedicates caves to non-Buddhist ascetics in his inscriptions, and he constantly says that both Brahmins and shramanas deserve respect. However, the Ashokavandana mentions a few incidents of violence during his later reign, notably those against Jains.
