Medieval history of Nepal

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In the 11th century, a powerful empire of Khas people emerged in western Nepal whose territory at its highest peak included much of western Nepal as well as parts of western Tibet and Uttarakhand of India. By the 14th century, the empire had splintered into loosely associated Baise rajyas, literally 22 states as they were counted. The rich culture and language of the Khas people spread throughout Nepal and as far as Indo-China in the intervening centuries; their language, later renamed the Nepali language, became the lingua franca of Nepal as well as much of North-east India. In south-eastern Nepal, Simraungarh annexed Mithila around 1100 AD, and the unified Tirhut stood as a powerful kingdom for more than 200 years,^[1] even ruling over Kathmandu for a time. After another 300 years of Muslim rule, Tirhut came under the control of the Sens of Makawanpur.^[1] In the eastern hills, a confederation of Kirat principalities ruled the area between Kathmandu and Bengal.

In the Kathmandu valley, the Mallas had established themselves in Kathmandu and Patan by the middle of the 14th century. The Mallas ruled the valley first under the suzerainty of Tirhut but established independent reign by late 14th century as Tirhut went into decline. In the late 14th century, Jayasthiti Malla introduced widespread socio-economic reforms, principal of which was the caste system. By dividing the indigenous non-Aryan Buddhist population into castes modelled after the four Varna system of Hinduism, he provided an influential model for the Sanskritization and Hinduization of the indigenous non-Hindu tribal populations in all principalities throughout Nepal. By the middle of the 15th century, Kathmandu had become a powerful empire which, according to Kirkpatrick, extended from Digarchi or Sigatse in Tibet to Tirhut and Gaya in India. In the late 15th century, Malla princes divided their kingdom in four – Kathmandu, Patan and Bhaktapur in the valley and Banepa to the east. The competition for prestige among these brotherly kingdoms saw the flourishing of art and architecture in central Nepal, and the building of famous Kathmandu, Patan and Bhaktapur Durbar Squares; their division and mistrust led to their fall in the late 18th century, and ultimately, the unification of Nepal into a modern state.

Apart from one destructive sacking of Kathmandu in the early 13th century, Nepal remained largely untouched by the Muslim invasion of India that began in the 11th century. However, the Mughal period saw an influx of high-caste Hindus from India into Nepal. They soon intermingled with the Khas people and by the 16th century, there were about 50 Rajput-ruled principalities in Nepal, including the 22 (Baisi) states in western Nepal and, to their east in west-central Nepal, 24 Chaubisi states.