Ashoka, the Mauryan Emperor, was known for his brutal conquest of Kalinga, which left him with a deep sense of remorse and guilt. He then adopted Buddhism as his religion and made it the state religion of his empire. This decision had a profound impact on Indian history and greatly influenced the spread of Buddhism in India and beyond.

Reasons for Ashoka's Conversion to Buddhism:
1. The Kalinga War: The Kalinga War was a turning point in Ashoka's life. The war was brutal, and Ashoka saw the destruction and suffering caused by it. He was deeply affected by the loss of life and the misery he had caused, and he began to question the purpose of his conquests.

2. The Influence of Buddhist Teachings: Ashoka was exposed to Buddhist teachings and philosophy, which emphasized non-violence, compassion, and the importance of moral conduct. He was impressed by the teachings of Buddha and his emphasis on peace and non-violence.

3. Personal Tragedies: Ashoka suffered personal tragedies, including the death of his wife and children, which made him question the meaning of life and the pursuit of power.

Impact of Ashoka's Conversion:
1. Spread of Buddhism: Ashoka's patronage of Buddhism helped to spread the religion throughout India and beyond. He sent missionaries to different parts of the world, including Sri Lanka and Southeast Asia, to spread the teachings of Buddhism.

2. Promotion of Non-Violence: Ashoka's conversion to Buddhism led him to promote non-violence and peace. He issued edicts that called for the protection of animals, the abolition of the death penalty, and the promotion of tolerance and respect for other religions.

3. Legacy: Ashoka's legacy as a ruler who promoted peace and non-violence has had a lasting impact on Indian history. He is remembered as one of India's greatest emperors and a champion of human rights.

Conclusion:
Ashoka's conversion to Buddhism was a significant event in Indian history. It helped to spread the teachings of Buddhism and promote non-violence and peace. His legacy as a ruler who promoted human rights and compassion continues to inspire people today.

Ashoka choose buddhism and refusing digvijaya and using dhammavijya and ahimsa was the main rule of Buddhism