Question

Ashoka the great converted to buddism in which year

Answer 1

However, according to Basham, the Dharma officially propagated byAshoka was not Buddhism at all. Nevertheless, his patronage led to the expansion of Buddhism in the Mauryan empire and other kingdoms during his rule, and worldwide from about 250 BCE.

Answer 2

heya........

the answer is
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well Ashoka the great didn't supported any one religion but buddhism was more spread during 250BCE

hope it helps ^_^