Phra Ubosot, the Assembly Hall for performing the monastic ritual, was constructed in the reign of King Rama I in Ayudhya style. It was then reconstructed and enlarged during the reign of King Rama III. All sheltered windows and doors are made of hard wood with crown–like spires and colour-glazed tiles. Inlays of mother–of–pearl on the outer side of the entrance door panels depict episodes from the Ramakien (the Thai version of the Ramayana – the world famous Indian epic); while on the inner side are painted specimens of ecclesiastical fans of rank which are presented to the monk sovereigns.