Wikipedia
Ajatashatru (; Pali: Ajātasattu; Kunika; ) was a king of the Haryanka dynasty of Magadha in North India. He was the son of King Bimbisara and was a contemporary of both Mahavira and Gautama Buddha. He forcefully took over the kingdom of Magadha from his father and imprisoned him. He fought a war against Vajji, ruled by the Lichchhavis, and conquered the republic of Vaishali. Ajatashatru followed policies of conquest and expansion. He defeated his neighbours including the king of Kosala; his brothers, when at odds with him, went to Kashi, which had been given to Bimbisara as dowry. This led to a war between Magadha and Kosala. Ajatashatru occupied Kashi and captured the smaller kingdoms. Magadha under Ajatashatru became the most powerful kingdom in North India.