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. Significance The establishment of the Amarapura Nikaya was significant because it signaled a change in the social dynamic of Buddhism in Sri Lanka. For the first time, a monastic lineage had been created not through royal patronage of a Buddhist king, but through the collective action of a dedicated group of Buddhist laymen. The Amarapura Nikaya was thus both independent of government and royal power, and more closely tied to its patrons in the growing middle class. This presaged both the growing power of the middle class in Sri Lanka during the 19th and 18th Centuries, and the rise of so-called Protestant Buddhism among the Sinhalese middle class- a modernized form of Buddhism in which increasing power and authority were vested in the laity, rather than monastic authorities. Amarapura Mahasangha Sabha The Amaprapura nikaya which was divided in to several sub nikayas (sub-orders) in the past was united on the initiatives taken by Balangoda Ananda Maitreya Thero and Madihe Pannaseeha Thero in the late 1960s. 'Sri Lanka Amarapura Mahasangha Sabha' was formed and a common higher ordination ceremony for all Amarapura nikaya was performed at the Uposathagharaya situated at Siri Vajiranana Dharmayatanaya, Maharagama on July 13, 1969. The event was graced by the then head of State, Governor-General of Ceylon William Gopallawa. 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. In addition to the supreme Mahanayaka position a post for the president of the Amarapura Nikaya was created and Balangoda Ananda Maitreya thero was appointed as the first president of Amarapura Mahasangha Sabha. On 16th of 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. The following is a list of Supreme mahanayaka theros of the Amarapura Nikaya. Sub-orders Right before its unification into the Amarapura–Rāmañña Nikāya, the Amarapura Nikāya was divided into no less than 21 sub-orders. These sub orders are believed to have been formed along caste divisions and regional differences. Amarapura Sirisaddhammawansa Maha Nikaya Amarapura Mulawamsika Nikaya Udarata Amarapura Nikaya