However, in 1764, merely a decade after the reestablishment of the Buddhist order in Sri Lanka by reverend Upali, a group within the newly created Siam Nikaya succeeded in restricting upasampada only to the Govigama caste.
Mandarampura Puvata, a text from the Kandyan period, narrates the above radical changes to the monastic order and shows that it was not a unanimous decision by the body of the sangha.
The Govigama exclusivity of the Sangha thus secured in 1764 was almost immediately challenged by other castes who without the patronage of the King of Kandy or of the British, held their own upasampada ceremony at Totagamuwa Vihara in 1772.
As a consequence of this 'exclusively Govigama' policy adopted in 1764 by the Siyam Nikaya, the Buddhists in the maritime provinces were denied access to a valid ordination lineage.
The monk agreed to the suggestion of the captain and the latter, through the Dutch consul at Hanthawaddy (now Bago, Burma), obtained the necessary introductions to the religious and administrative authorities in Amarapura.
Soon after their return to the island they established a udakhupkhepa sima (a flotilla of boats moved together to form a platform on the water) at the Maduganga River, Balapitiya and, under the most senior Burmese bhikkhus who accompanied them, held an upasampada ceremony on the Uposatha of Vesak.
However, the radical change of ordination rules by the Siam Nikaya in 1764 and its continuance despite it being contrary to the teachings of the Gautama Buddha, plagues the Sri Lankan Buddhist Sangha, which remains divided on caste lines.
It maybe further justified by the fact that the Govigama were the earlier inhabitants of the Sinhalese ethnicity before the arrival and integration of the Karava, Durava and Salagama from South India.
[citation needed] The establishment of the Amarapura Nikaya was significant because it signaled a change in the social dynamic of Buddhism in Sri Lanka.
A supreme Mahanayaka position for the Sri Lanka Amarapura Mahasangha Sabha was created with this initiative and Madihe Pannaseeha thero was appointed as the first monk to hold the prestigious title.
[6] On 16 August 2019, the Amarapura and Ramanna Nikaya were unified as the Amarapaura-Ramanna Samagri Maha Sangha Sabha, making it the largest Buddhist fraternity in Sri Lanka.