Thibbatuwawe Sri Siddhartha Sumangala Thero is a Sri Lankan Buddhist monk who is the present Mahanayaka Thero of the Malwatta chapter of Siam Nikaya.
He was appointed as the 26th Mahanayke Thera of Malwatta Chapter on 20 June 2004, by the Karaka Sangha Sabha of Malwatta chapter, after the demise of Most Ven. Rambukwelle Sri Dharmarakkitha Vipassi Mahanayka Thera. His act of appointment was presented on 16 August 2004 at the historic Magul Maduwa in Kandy.
Theravāda is the most commonly accepted name of Buddhism's oldest existing school.
The school's adherents, termed Theravādins, have preserved their version of Gautama Buddha's teaching or Buddha Dhamma in the Pāli Canon for over a millennium.
Aided by the patronage of Mauryan kings like Ashoka, this school spread throughout India and reached Sri Lanka through the efforts of missionary monks like Mahinda.
Starting at around the 11th century, Sinhalese Theravāda monks and Southeast Asian elites led .