The Mahindagamanaya (Sinhala: මහින්දාගමනය; literally "Arrival of Mahinda") refers to the historically significant event of the arrival of Arahant Mahinda, the son of Emperor Ashoka of India, in Sri Lanka during the 3rd century BCE. This pivotal moment is traditionally believed to have occurred on the full moon day of the month of Poson (June) at Mihintale, a mountain peak near Anuradhapura, the then capital of Sri Lanka.
Historical Context and Significance: Arahant Mahinda, accompanied by fellow Arahants Itthiya, Uttiya, Sambala, Bhaddasala, and the novice monk Sumana Samanera, was dispatched by Emperor Ashoka following the Third Buddhist Council to propagate the teachings of the Buddha. Upon their arrival in Sri Lanka, they encountered King Devanampiyatissa, the reigning monarch, while he was on a hunting expedition. Through a series of questions and a discourse on the Chulla Hatthipadopama Sutta (The Shorter Discourse on the Simile of the Elephant's Footprint), Arahant Mahinda enlightened the King, who subsequently embraced Buddhism along with his retinue.
The Mahindagamanaya marks the official introduction of Theravada Buddhism to Sri Lanka. This event had profound and lasting impacts on the island's history, culture, and society:
- Religious Transformation: Buddhism became the state religion and deeply integrated into the spiritual and daily life of the Sinhalese people.
- Establishment of the Sangha: Arahant Mahinda established the Bhikkhu Sangha (order of monks) in Sri Lanka, laying the foundation for a continuous monastic tradition that thrives to this day. His sister, Arahant Sanghamitta, later arrived with a sapling of the Jaya Sri Maha Bodhi tree and established the Bhikkhuni Sangha (order of nuns).
- Cultural and Architectural Development: The introduction of Buddhism spurred significant advancements in art, architecture, literature, and irrigation. It led to the construction of grand stupas, monastic complexes, and the development of a unique Buddhist civilization.
- Social and Political Impact: Buddhist principles influenced governance, law, ethics, and social organization, shaping the distinctive Sinhala Buddhist identity. Monasteries became centers of learning and culture.
Commemoration: The Mahindagamanaya is one of the most revered events in Sri Lankan history and is commemorated annually on the Poson Full Moon Poya Day. Poson Poya is a major national religious holiday in Sri Lanka, marked by widespread religious observances, pilgrimages to Mihintale and other sacred sites, and various cultural activities that celebrate the enduring legacy of Buddhism on the island.