Ajatshatru fort is a major tourist attraction in suburb Begusarai. It was built in the 6th century by the king of Magadha, Ajatshatru. The son of King Bimbisar and Queen Chelna, he was known as the most feared and powerful king to ever rule over Magadha.
Traditions in Jain and Buddhist differ a little in small details, but he was a follower of both traditions. He ruled over majority of Northern India and he was the one who built Pataliputra, now known as Patna, the capital of the state. He has eight wives, according to Jain legends. He is known to die in 461 BC. The fort is an important defending fortress and is now mostly in ruins. It is of high historical importance.