The rule of Ashoka is widely known through the rock edicts that he left behind, which in itself allowed his vision to reach the people in all corners of the vast Mauryan Empire. He is called great because of his model rule based on peace and compassion that helped in unifying the culturally diverse empire under a centralised administration.
For further reading check the following articles:
|100 Differences Between Articles||UPSC Prelims|
|NCERT Medieval Indian History Notes UPSC||UPSC Mains Questions (2013-2019)|
|NCERT Ancient Indian History Notes UPSC||NCERT Modern Indian History Notes UPSC|