In the fertile hills of eastern Nepal, the indigenous Kirat Rai people preserve an ancient, rich worldview through their sacred oral scripture, the Mundum. Unlike traditions reliant on static, written dogmas, the Mundum is a living, genealogical record that centers human identity around nature, ancestral roots, and community survival. Within this cosmological framework, the stories of three ancestral siblings Tayama, Khiyama, and Hetchhakupastand as foundational pillars. They are not merely characters of legend; they are revered as the primary culture heroes who introduced civilization, agriculture, and craftsmanship to the Kirat lineage.
The factual framework of Kirat history is deeply tied to physical, sacred geography. The Mundum places the lives of Tayama, Khiyama, and Hetchhakupa directly on Tuwachung Hill (located in the present-day Khotang District of eastern Nepal). Archaeological interest and local social memory treat Tuwachung not as a mythical realm, but as the ancestral cradle of the Rai people. It is here that the early Kirat ancestors transitioned from nomadic foraging to structured, communal settlements.
In Kirat culture, technological evolution is historically credited to female leadership. Tayama (the elder sister) and Khiyama (the younger sister) are documented in oral history as the first skilled weavers of the Himalayan foothills.


Hetchhakupa (also phonetically captured as Hetakupcha or known regionally as Raichhakule) was the younger brother of Tayama and Khiyama. While his sisters mastered material craftsmanship, Hetchhakupa focused on the survival of the community through the soil. He is celebrated as the ancestor who pioneered settled farming, domesticating native grains, and establishing animal husbandry. His relationship with his sisters symbolizes the foundational balance in early Kirat society between agricultural food production and material manufacturing.

Today, the legacy of these three siblings remains active in the daily lives of the Kirat Rai community:

Tayama, Khiyama, and Hetchhakupa represent the transition of the Kirat people from a primitive state into an advanced, self-sufficient society. By anchoring textile technology, agriculture, and artistic expression to these historical ancestors, the Mundum ensures that every thread woven and every seed planted remains an act of deep ancestral remembrance.