I have respect for all religion, castes, races and each culture that is associated with them. Each one of them have their own physical features, specialty and importance. Each one of them is different, but not less or inferior than any other. Comparing one to the other would be only for the sake of finding out the differences, and not deciding on which is superior to the other. This should be clarified to everybody. As being born and raised in the environment that we were, each one of us are and should be proud to belong to a specific caste, race, religion, and as a whole, to a specific community. So, it is very important for us to keep in mind these points when we discuss further.
Having said this, let us move on to a briefly stated History of Newars.
Jyapus were the first settlers of Kathmandu valley. They were the descendants of the Gopal Vanshas / Krishna Vanshas. They have been important part of the Newari community, and in those days, they were represented as the farmers of high skill and physical strength. Originally, Jyapus were at first Aryans who came down to the valley. Out of 621 castes, 411 castes belong to this community. Kathmandu Valley witnessed its first King, Bhuktaman, from the descendants of the Gopal Vanshas. Later on, the Kirats invaded the valley and the reign of the Gopal Vanshas was put to an end. After this invasion, the Kirats forced them to be involved only in agricultural works. This is how the Jyapu community first got linked with this occupation. The first traces of Nepal Bhasa is therefore linked the Gopal Vanshas, and also influenced by the Kirats, which is why some of the Kirats who speak or are familiar with this language are called Newar Kirats and they fall within the Newar community.
The Kirat dynasty also came to an end when the Lichhivis attacked in the valley. The Lichhivis also learnt and accepted the local language. Then the Lichhivis again got invaded by the Baish
References: Shrestha, Dr. Tulsi Narayan. Nepal ka Newarharu, Pahichaan ra Pristhabhumi. Dhaubanjaar, Dr. Gopal. Kathmandu Upatyaka ka Bastiharu. Wright, Daniel. History of Nepal(translated from Parbatiya). Amatya, Tulsi Lal. Samsmaran ka Panaharu.