With which country had nepal established diplomatic relation first?

The United Kingdom

Explanation:

The United Kingdom is also the first country in the world with which Nepal had established diplomatic relations. The United Kingdom is the first country in the world which established its Embassy in Kathmandu, the capital of Nepal. This is the country where Nepal had established its first diplomatic mission (Legation).

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.