I have been unable to confirm when the bas-reliefs around the Ubosot were carved. One theory is that were brought from Ayutthaya by Rama I after the destruction of that city. To my mind, after seeing the way everything was pillaged and broken at Ayutthaya I find this doubtful. It may be that they were commissioned by one of the early Kings of the Ratanakosin period.

The 162 reliefs present scenes from the Ramakien, the Thai National Epic, and have plaques in Thai describing each scene, but the photographs of the plaques weren't clear enough to read and that part has been discarded here, but they now stand unidentified.

Note that the photographs have had to be processed to bring out the relief more clearly, this has involved adjusting the contrast and gamma, which makes them appear darker than they really are. A more natural view, where the reliefs are evidently much lighter, can be seen above. Even after processing, the first few in the sequence, which follows the story chronologically, are hard to make out and the same with some of the others. But most are easier to read now.