Ajatashatru was the son of king Bimbisara and the second king of the Haryanka dynasty. He killed his father and seized the throne for himself. He succeeded his father around 492 BCE and ruled for approximately 32 years. His region saw high watermark of the Haryanka Dynasty. He took an aggressive policy for expansion and made Magadha most powerful state of that time.
Bimbisara was the king of Haryanka dynasty, He was the first king of Magadha who begun the policy of conquest and aggression which ended with the Kalinga war of Ashoka. His father Bhatiya founded the Haryanka dynasty but the actual establishment of kingdom was done under Bimbisara so he was considered as actual founder of dynasty.
According to the Buddhist text Mahavamsa, he ascended throne at the age of fifteen and ruled for 52 years(roughly from 544 BCE to 492 BCE).
King Bhatiya founded the Haryanka Dynasty in the middle of the 6th century BCE. Although actual establishment of kingdom was done under the rule of Bimbisara so he was considered as actual founder of the dynasty. Haryanka dynasty was the second ruling dynasty of Magadha after Brihadratha Dynasty.
Magadha had played very important role in Indian History, For many centuries it was the center of many large kingdoms, empires and culture heritage. It is the birthplace of Jainism and Buddhism. Magadha was located in north-eastern India, which is now west-central Bihar state.
Magadha’s root were found from the Atharvaveda, but at that time it was not the place liked by Aryans.
Magadha was mentioned in Ramayana as a place inhabited by opulent(Samruddhajanasevith – rich peoples). It was very fertile place richly filled with corns.