What is "chetaka"

Chetaka, called King Chetaka or President Chetaka was the representative of the Licchavi clan who ruled as a Republican President in Vaishali ( India) reputed to have organised the Vajjian confederation of republics comprising the 9 Mallakis, 18 Gana Rajas of Kashi/ Kosala and 9 Licchavi Republics. He lived in the 5th century BC and was a contemporary of Buddha and Mahavira. His system of government appears to have been a republican committee which elected a ceremonial king to act upon the committee's advice. His daughter Trishala was married to Siddhartha and gave birth to 24th Tirthankara Mahavira. His another daughter Chellana married Bimbisara.