Phra Prathon Chedi (Thai: พระประโทณเจดีย์, pronounced [pʰráʔ prā.tʰōːn t͡ɕēː.dīː]) is one of the oldest stupas in Thailand with the height of 50 metres (164 ft).

According to legend after the cremation of Gautama Buddha, his relics were equally divided amongst 8 royal families and his disciples by using a golden Thona.

This golden Thona eventually sent to ancient Nakhon Chai Si in Suvarnabhumi and kept inside a stone stupa in 590.

In 656 King of Lavo ruled Nakhon Chai Si and rebuilt the stupa and named Phra Prathon Chedi.

The original of Phra Prathon Chedi has no historical record, but according to archaeological survey findings date back to the 4th century.

Granny Hom raised Phan in Ratchaburi, a vassal city state of Nakhon Chai Si.

Vajiravudh started excavation on Phra Prathon Chedi Temple ground, and found many historic artefacts.