This is the main archaeological site which was discovered during excavations in 1971-76. Thirty-one terracotta sealings were discovered, which gave a clue to the location of ancient Kapilvastu, the capital of the Shakyas. They are inscribed in Brahmi Characters of the first-second Century A.D. one of the legends on the seals read – “Om Deoputra Vihare Kapilvastu Bhikshu Sanghasa”. The title Deoputra refers to Kushana ruler Kanishka, a great patron of Buddhism who built the biggest Vihara at Piprahwa and renovated the main stupa here. It could be inferred therefrom that the ancient city of Kapilvastu must be in the immediate neighbourhood of the stupa & the monastery.
Excavation of the main stupa yielded another two relic-caskets containing charred bones. The caskets of different sizes, are made of soapstone, skilfully turned on a lathe. The discovery is of considerable significance, during the closing years of the last century, a stone box, containing relic-coaster of the same material and shape but of different sizes, was excavated from the stupa. One of the caskets in the earlier collection bore an inscription in Ashokan Brahmi.