The presence of non-Sanskrit speaking in the Kathmandu Valley since long before its Lichchhavi takeover around the first century AD is now generally recognized. The Department of Archaeology is currently excavating an ancient Kirati religious site near Kwalakhu in Patan. Existence of several non-Sanskrit place names, administrative, office titles, river names in Lichchhavi inscription is generally cited as proof of developed state of the valley during the Kirat rule.

The bulk of the material contained in the Puranas was established during the reign of the Guptas (320-500 CE ).
In the Vishnu Purana, it is mentioned that the "chatur-varna" or four class social system was absent among the Kiratas in Kiratdesa in the east and the Yavanas(Greek) and Kambojas(Iranian), etc. in the pashchima or west. (Vishnu Purana, 2.37). This clearly shows that Kiratdesa(Nepal) did not have any vedic culture up to this point. The chatur-varna that ultimately resulted in caste discrimination hence entered Nepal after the arrival of Lichchhavi from northern India in around 300 AD

Since no one was able to answer the question on how the sati practiced came to exist in Nepal, we can correctly assume that this practice was brought by the Lichchhavi. And with reference to example given by Obama about the ritual during King Mandev, there's no doubt that along with "chatur-varna",
the sati came to exist in Nepal after arrival of Lichchhavi.

Another question, when was this practice outlawed in Nepal. In India, the practice of sati was banned by the British in 1829.
Also Nepal was a sovereign nation and there was no British governing Nepal then. So any idea how this ritual dissapeared from Nepal scene?

Now coming back to Buddhism, does anyone have the idea about the Mahayana Buddhists?
If yes could you please explain to me how the Mahayana Buddhists understand emptiness(sunyata)?

Has anyone read about Dalai Lama?
What principles of Buddhism is the Dalai Lama applying to the modern world?

Much appreciated