Vatsa

Kingdom of Vatsa
c. 700 BCE–c. 300 BCE
Vatsa and other Mahajanapadas in the Post Vedic period.
CapitalKauśāmbī, Prayāga
Common languagesPrakrit
Sanskrit
Religion
Historical Vedic religion
Jainism
Buddhism
GovernmentMonarchy
Maharaja 
• 8th century B.C.
Nicakṣu (first)
• 4th century B.C.
Kṣemaka (last)
Historical eraIron Age
• Established
c. 700 BCE
• Disestablished
c. 300 BCE
Preceded by
Succeeded by
Kuru Kingdom
Magadha
Today part ofAllahabad division of Uttar Pradesh, India

Vatsa or Vamsa (IPA: [ʋɐt̪sɐ], Pali and Ardhamagadhi: Vaccha, IPA: [ʋɐtːʃʰɐ], literally "calf") was one of the sixteen Mahajanapadas (great kingdoms) of Uttarapatha of ancient India mentioned in the Aṅguttara Nikāya.