Kupilvaslu was the ancient capital of the Sakya clan whose ruler was. the father of the Buddha, for which reason the Buddha is also referred to as the Sakyamuni. The Sakya domain was one of the sixteen independent principalities of the 6th century BC. Prince Gait tarn, as the Buddha was then known, left his palace in Kapilvastu at the age of 29. and revisited it 12 years later, lung after lie had attained enlightenment.
Today, Kapilvastu comprises of several villages.A large stupa stands at the ancient site which is said to have housed the bone relics of the Buddha. The presence of these relics arc testified by an ancient Brahmi inscription discovered at Piprahwa. The ruins of the palace are spread over a large area.