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Late medieval · Buddhist · Thailand
Phra That Si Song Rak
Dan Sai, Loei Province · 17.2700°, 101.1425°
Commemorative that of the Lan Xang–Ayutthaya friendship pactLan Xang / Ayutthaya—
Sacred since
1560 CE
first attestation / structure
Standing structure
c. 1560
Lan Xang / Ayutthaya
History & significance
A 20-metre stupa at Dan Sai in Loei, raised around 1560 jointly by King Setthathirath of Lan Xang and King Maha Chakkraphat of Ayutthaya to seal a mutual-defence pact; its name means the stupa in honour of two loves. A stone inscription pledging that neither kingdom would violate the other’s territory once stood here, and the monument appears on the seal of Loei province.