Explanation:

Ashoka:
- Ashoka, also known as Ashoka the Great, was an emperor of the Maurya Dynasty who ruled most of the Indian subcontinent from 268 to 232 BCE.
- He is famously known for erecting stone pillars across the north Indian part of the Mauryan Empire.
- These stone pillars, known as Ashoka pillars, were erected to spread his message of Dhamma (Buddhist teachings) and to promote moral values and welfare of his people.

Reason for Erecting Stone Pillars:
- Ashoka erected these stone pillars as a way to communicate his edicts and policies to his subjects.
- The inscriptions on these pillars were written in various languages including Prakrit, Greek, Aramaic, and Sanskrit, making them accessible to a diverse population.

Symbolism:
- The Ashoka pillars are topped with sculptures of lions, which became a symbol of Ashoka's rule and were later adopted as the national emblem of India.
- These pillars symbolize Ashoka's commitment to upholding Dhamma and promoting peace and harmony among his people.

Legacy:
- Ashoka's stone pillars serve as a lasting legacy of his reign and continue to be important historical and archaeological artifacts.
- They provide valuable insights into the governance, culture, and beliefs of the Mauryan Empire under Ashoka's rule.
In conclusion, Ashoka erected the stone pillars in the north Indian part of the Mauryan Empire to communicate his edicts and promote moral values among his subjects. These pillars continue to be a significant historical and cultural symbol of Ashoka's reign.