The day on which we commemorate the introduction of Buddhism in Sri Lanka by Arahat Mahinda Maha Thero (son of King Asoka of India) in Mihintale in the third century BC Ven Mahinda Buddha dispensation (Buddhasasana) in Sri Lanka founded.
The full moon Poson Poya day is remarkable for Buddhists in Sri Lanka as the day introduced to the son of Asoka, who Arahat Mahinda, officially Buddhism on the island in the 3rd century BC
Therefore, in addition to the normal ritual observances in a Poya day is carried out, followers Anuradhapura Poson day, the sacred ancient capital of the country pushing because it was there that Arahat Mahinda converted the then ruler, King Tissa Devanampiya, and his court Buddhism so set in motion a series of events that eventually made Sri Lanka the home of Theravada Buddhism.
Even today the Poson Poya, Anuradhapura be the center of Buddhist activities. Mihintale, the point at which held the epochal encounter between the old and the king thus obtained, reverential attention of followers.
The two pilgrims rituals and observance of the eight precepts are combined here. Processions commemorating the event, called Mihindu Pera Heras, are held in various parts of the country.