Across the lake from the temple of the Tooth Relic, is situated one of the great centres of the Sangha, belonging to the Siam Nikaya, known as “Malwatu Maha Viharaya”. This great monastery consists of two sections. The first is the “Uposatha Viharaya” on the right, popularly known as “Poyamalu Viharaya” and the other “Pushparama Viharaya” popularly known as “Malwatu Viharaya” which is seen today with a newly built octagon. Of these two complexes, the older is the Poyamalu Viharaya, supposed to have been built by Senasammata Vikramabahu (1473-1511) with a two storeyed Uposathagaraya or Ordination Hall and a Caitya or a Dagaba close by. The Chronicle goes on to say that he further built 86 monasteries for the use of the monks in the two fraternities namely, Malwatu and Asgiri Viharas. This account is further supported by Sulu Rajawaliya, Asgiri Talpata, and Pohoya Malu Upatha.
It is believed that this temple initially had only 3 dwelling places. One was “Sangaraja Pansala” dedicated for the great Velivita Sri Sarankara Thero. The “Thibbotuwawe Pansala” and the “Poyamalu Viharaya” was for the chief monk Thibbotuwawe thero and the “Meda Pansala” for Moratota who was the the “Raja Guru” or the Kings Teacher. All these temples can be seen today and the Sangaraja Pansala, today known as “Welivita Pansala” houses all the personal belongings that the great Velivita Sri Sarankara Thero used. A room in the Thibbotuwawe Pansala displays belongings of the Thibbotuwawe Thero.