It's an alt.history map where King Jayasthiti Malla's attempts to unite the fallen Nepala Mandala in the 1370s succeeds thus reuniting Nepal 4 centuries ahead of schedule. His successors slowly expand in the weakening Jaunpur Sultanate and the instable Bengali Rajah & sultanate periods.
I am aware that it's an alternate history map, thank you.
(Nepal as a name for a certain area within modern day Nepal has certainly been around for a long time. I'm a bit uncertain whether every Kathmandu valley centered empire is going to use that as a state name: it just struck me that it having the same name is a bit present-ist, given that OTL it also went by the names of Gorkha Empire and Asal Hindustan. But perhaps I nitpick too much.)