Tissa, later Devanampiya Tissa was one of the earliest rulers of Sri Lanka based at the ancient capital of Anuradhapura from 307 BC to 267 BC. His reign was notable for the arrival of Buddhism in Sri Lanka under the aegis of the Mauryan Emperor Ashoka. The primary source for his reign is the Mahavamsa, which in turn is based on the more ancient Dipavamsa.