Kashyapa I, also known as Kasyapa I, is a king of Sri Lanka, who rules the country from 473 to 495 CE.
He is the second king of the royal Mauryan dynasty of Sri Lanka.
Kashyapa is credited with the construction of the Sigiriya citadel and the surrounding city.
He acquires the throne by overthrowing his father, King Dhatusena, and usurping his brother and rightful heir to the throne, Moggallana, in a palace coup.
He imprisons and later executes his father.
Kashyapa is also known as Pithru Ghathaka Kashyapa (Kashyapa the Patricide), after this incident.
He is later defeated by Moggallana, who had fled to South India and returns with an army to regain the throne.