Today is Full Moon Poya of Poson day, the day that commemorates the introduction of Buddhism to Sri Lanka by Arahat Maha Mahinda thero.
Poson, held on the full moon day of June, commemorates the occasion over 2,000 years ago when Arahat Mahinda, son of Emperor Asoka of India (Warrior King transferred him-self to a pious King), converted King Devanampiyatissa to Buddhism.
The main centre of celebration is Mihintale, the ancient monastic complex where the mission headed by the Arahant Mahinda included Itthiya, Utthiya, Sambala and Bhaddasala Theras perched the first sermon to the ruling kin , Devanampiyatisa, at Anuradhapura, thereby setting in motion a series of events that eventually made Sri Lanka the home of Theravada Buddhism.
For Buddhists, this hallowed day of Poson is second only to Vesak in terms of importance given to this special day.