In the 18th century, it used to be a route back from Vientiane of the Somdet Chaophraya Maha Kasatsuek (later King Rama I)'s army.

He and the Buddha image stayed overnight here before going back to Bangkok.

The result of the division of the new administrative area make Phra Kaeo Railway Station and Wat Phra Kaeo (the place where the Phra Kaeo Morakt was enshrined was later built as a temple) belonging to the neighbouring Krachio.

The seal of SAO Phra Kaeo shows Phra Kaeo Morakot in meditating posture along with the ears of rice adorned as a frame.

[3] Phra Kaeo can be reached via Highway 33 (familiarly known as Suwannasorn Road).