The written history of Nepal begins with the dynasty of Gopal (Sa Poo) and Mahispal (Mey Poo). The Gopali people are still found in Tistung, Palung and near villages. According to the research done on Gopali people by Dr. Chunda Bajracharya, she has concluded that the Gopali people are still following Newar culture and language. So the Gopali people are the Newars.
This clarifies that the Newars
are the first rulers of Nepal. Since then, the Newars are still living
here. However, many immigrants came to Nepal mandal from different
places in different time and followed Newar language & culture and
became Newars. This brought cultural and lingual diversity among the
Newars.
http://www.newah.org/newahcms/index.php?option=com_content&task=view&id=25&Itemid=38