The Mauryan Empire marked the first significant political unification of the Indian subcontinent, initiated by Chandragupta Maurya in 322 BCE. The empire reached its zenith under Ashoka, who championed Buddhism and a code of ethics following the Kalinga War, greatly influencing future Indian governance and culture. Its administration was noted for its organization and efficiency, while its decline was attributed to weak successors and internal strife, setting a precedent for future empires in India.