The Mauryan Empire was a geographically extensive Iron Age historical power in ancient world, ruled by the Mauryan dynasty from 321 to 185 BC. Originating from the kingdom of Magadha in the Indo-Gangetic plains (modern Bihar, eastern Uttar Pradesh and Bengal) in the eastern side of the Indian subcontinent, the empire had its capital city at Pataliputra (modern Patna). The Empire was founded in 322 BC by Chandragupta Maurya, who had overthrown the Nanda Dynasty and rapidly expanded his power westwards across central and western India taking advantage of the disruptions of local powers in the wake of the withdrawal westward by Alexander the Great's Greek and Persian armies. By 320 BC the empire had fully occupied Northwestern India, defeating and conquering the satraps left by Alexander.
Chola dynasty was a Tamil dynasty which was one of the longest-ruling dynasties in southern India. The earliest datable references to this Tamil dynasty are in inscriptions from the 3rd century BC left by Ashoka, of Maurya Empire; as one of the Three Crowned Kings, the dynasty continued to govern over varying territory until the 13th century AD.
The Cholas left a lasting legacy.The Chola kings were avid builders and envisioned the temples in their kingdoms not only as places of worship but also as centres of economic activity. They pioneered a centralised form of government and established a disciplined bureaucracy.
The Maratha Empire or the Maratha Confederacy was an Indian imperial power that existed from 1674 to 1818. At its peak, the empire covered much of India, encompassing a territory of over 2.8 million km². The Marathas are credited for the re-establishment of Hindu rule in India.Initially deriving from the western Deccan, the Marathas were a peasant warrior group that rose to prominence during the rule in that region of the sultans of Bijapur and Ahmadnagar. The empire was founded and consolidated by Chhatrapati ("Emperor") Shivaji Bhosle.
The Gupta Empire was an ancient Indian empire which existed from approximately 320 to 550 CE and covered much of the Indian Subcontinent. This period is called the Golden Age of India and was marked by extensive inventions and discoveries in science, technology, engineering, art, dialectic, literature, logic, mathematics, astronomy, religion and philosophy that crystallized the elements of what is generally known as Hindu culture.The 4th century CE Sanskrit poet Kalidasa, credits Guptas with having conquered about twenty one kingdoms, both in and outside India, including the kingdoms of Parasikas (Persians), the Hunas, the Kambojas tribes located in the west and east Oxus valleys, the Kinnaras, Kiratas etc.