The Maurya Empire was a geographically-extensive Iron Age historical power founded by Chandragupta Maurya which dominated ancient India between 322 BCE and 180 BCE. Comprising the majority of South Asia, the Maurya Empire was centralized by conquering the Indo-Gangetic Plain in the eastern extant of the empire and had its capital city at Pataliputra (modern Patna).
The empire was the largest to have ever existed in the Indian subcontinent, spanning over 5 million square kilometres (1.9 million square miles) at its zenith under Ashoka.
Chandragupta Maurya raised an army, with the assistance of Chanakya (also known as Kauṭilya),[4] and overthrew the Nanda Empire in c. 322 BCE. Chandragupta rapidly expanded his power westwards across central and western India by conquering the satraps left by Alexander the Great, and by 317 BCE the empire had fully occupied Northwestern India.
The Mauryan Empire then defeated Seleucus I, a diadochus and founder of the Seleucid Empire, during the Seleucid–Mauryan war, thus gained additional territory west of the Indus River.
The Maurya Empire was one of the largest empires of the world in its time. At its greatest extent, the empire stretched to the north along the natural boundaries of the Himalayas, to the east into Assam, to the west into Balochistan (southwest Pakistan and southeast Iran) and the Hindu Kush mountains of what is now Afghanistan.
The Empire was expanded into India's central and southern regions by the emperors Chandragupta and Bindusara, but it excluded a small portion of unexplored tribal and forested regions near Kalinga (modern Odisha), until it was conquered by Ashoka.
It declined for about 50 years after Ashoka's rule ended, and it dissolved in 185 BCE with the foundation of the Shunga dynasty in Magadha.