Conversation so far:
How early were the first Sinhalese kingdoms mentioned?
Early recorded history of the Sinhalese is chronicled in two documents, the Mahavamsa, written in Pāli around the 4th century CE.
Was Vijaya a king in Sri Lanka?
Prince Vijaya was the traditional first Sinhalese king of Sri Lanka

Question: What year was this?
Self-contained rewrite: What year was Vijaya's reign in Sri Lanka?