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.

We were taught in class that Lichchhavi period was the Golden era in Nepal history but i think this was false. In fact  Lichchhavi period was the beginning of  the downfall of Nepal society.
The caste system and other social problems that existed in Nepal came after the arrival of Lichchavi.
What do you folks think?