The Kirat were among the earliest inhabitants of the Kathmandu Valley and a large percentage of the Newar population is believed to have descended from them. The continuity of Newar society from the pre-Licchavi period has been discussed by many historians and anthropologists. The language of the Newars, Nepalbhasa, a Sino-Tibetan language, is classified as a Kirati language. Similarly, the over 200 non-Sanskritic place names found in the Sanskrit inscriptions of the Licchavi period of the first millennium C.E. are acknowledged to belong to the proto-Newar language; modern variants of many of these words are still used by the Newars today to refer to geographical locations in and around Kathmandu valley. Although the 14th century text Gopalarajavamsavali states that the descendants of the Kirata clan that ruled Nepal before the Licchavis resided in the region of the Tamarkoshi river, a number of Newar caste and sub-caste groups and clans also claim descent from the erstwhile Kirat royal lineage.