Baddhasima Prasadaya is the Pohoyageya or Uposathagharaya (Chapter House) of the monks of Alahana Piriwena where they rehearsed the codes of discipline (Especially the pati mokka). It is located in Polonnaruwa District of North Central Province, Sri Lanka.
The remaining pillars and brick walls suggest that there had been a multi-storied building and according to the Mahavamsa, there had been a twelve storied building. As such, this may be the largest of the Uposathaghara in the Island. The central Platform of the building was to locate the relic casket while four monks seated on the stone pedestal facing the cardinal directions read the code of discipline.