Three medieval Kingdoms of Nepal

Thirteenth-century Nepal was occasionally attacked by the rulers of Delhi Sultanate of northern India, and was consequently marked by increased Nepali militarisation. By the late 14th century, much of the country came under the rule of the king Jayasthitimalla, a Newar King, who managed to unite most of the fragmented power bases. This unity was short-lived; in 1482 the territory was carved into three kingdoms : Kathmandu, Patan, and Bhadgaon.
Most of the Nepalese architectural heritage such as temples, palaces including many UNESCO world heritage sites were built by Newars during the rule by Newar Kings. These include Kathmandu Old Palace (Kathmandu Durbar Square), Patan Palace (Patan Durbar Square), Bhaktapur Palace (Bhaktapur Durbar Square) etc.
Between 1717 and 1733, the Nepalese in the west, and also the Bhutanese from the east, attacked Sikkim many times, culminating with the destruction of the capital Rabdentse by the Nepalese. The Sikkim king fled to Tibet.