History & Civics
Answer
Sacrifices performed by Kings during the Vedic Age were:
Ashvamedha Yajna — During this yajna, the ruler would let loose a special horse, accompanied by soldiers, for a year to wander at will. The king would lay his claim over all those territories over which the royal horse moved unchallenged. If the horse was captured by another ruler, it meant war between two kingdoms. At the end of the year, the horse was sacrificed during the yajna.
Rajasuya Yajna — It was performed to confer supreme power on the king. It was connected with the King's consecration.
Vajapeya Yajna — The term 'Vajapeya' is a combination of two words 'vaja' and 'peya' meaning 'rice' and 'drink' respectively. As the name suggests, Vajapeya sacrifice was believed to bring in a bountiful corp and plentiful water.