Vatsa

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

Kosambi (Pali) or Kaushambi (Sanskrit) was an ancient city in India, characterized by its importance as a trading center along the Ganges Plain and its status as the capital of the Vatsa Kingdom, one of the sixteen mahajanapadas. It was located on the Yamuna River about southwest of its confluence with the Ganges at Prayaga (modern Prayagraj), which made it a powerful center for trade and beneficial for the Vatsa Kingdom.