Kashyapa I, also known as Kasyapa I, was a king of Sri Lanka, who ruled the country from 473 to 495 CE. He was the second king of the royal Moriya dynasty of Sri Lanka. Kashyapa is credited with the construction of the Sigiriya citadel and the surrounding city. He acquired the throne by overthrowing his father, King Dhatusena, and usurping his brother and rightful heir to the throne, Moggallana, in a palace coup. He imprisoned and later executed his father. Kashyapa was also known as Pithru Ghathaka Kashyapa (Kashyapa the Patricide), after this incident. He was later defeated by Moggallana, who had fled to South India and returned with an army to regain the throne. Kashyapa was killed in the battle that ensued.