What is "brihadratha"

Brihadratha (; IAST: Bṛhadratha), also known as Maharatha, was the founder of the Barhadratha dynasty, the earliest ruling dynasty of Magadha. According to the Mahabharata and the Puranas, he was the eldest of the five sons of Vasu, the Kuru king of Chedi and his queen Girika. The name of Brihadratha is also found in the Rigveda (I.36.18, X.49.6).