The Nanda dynasty ruled in northern part of the Indian subcontinent during the 4th century BCE, and possibly during the 5th century BCE. In 326 BC, Alexander invaded India, after crossing the river Indus he advanced towards Taxila.
Seven major pillar edicts have been found at Lauriya-Araraj, Lauriya Nandangarh, Rampurva, Nigali Sagar, Sarnath, Topra, and Meerut. Ashokan pillars probably signify the axis of the world (axis mundi) that separated heaven and earth.
The Ashokan Pillar Edict-VII mentions the Dhamma Mahamattas. It propagated a proper courtesy to slaves and servants, obedience to parents, respectful behaviour towards Brahmans and Sharmanas and generiosty towards friends, acquaintances and relatives.