Viharn Yod is situated to the north of the Library. Strong Chinese influences are revealed in the architecture of Viharn Yod, which was decorated with Chinese tiles similar to those used in Wat Arun. Viharn Yod houses two Buddha images, the Phra Nak and Phra Thepidorn. Phra Thepidorn was originally a Hindu image and was believed to represent King U-Thong, the founder of Ayutthaya, the capital prior to Bangkok. King Rama I had the sculpture brought down to Bangkok and casted it into a crowned Buddha image covered with silver. Phra Nak is a 4m high standing Buddha image of copper alloy. This image originated in Ayutthaya.