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Baise Rajya (Nepali: बाइसे राज्यहरू) were sovereign and intermittently allied petty kingdoms on the Indian subcontinent, ruled by Khas from medieval India, located around the Karnali-Bheri river basin of modern-day Nepal. The Baise were annexed during the unification of Nepal from 1744 to 1810. The kingdom's founder Prithvi Narayan Shah (ruled 1743-1775) did not live to see this, but his son and grandson annexed the entire collection by the end of the 18th century.
Simraungadh, Simraongarh or Simroungarh ( Devanagari: सिम्रौनगढ) was a fortified city and the main capital of the Tirhut Kingdom founded by Karnat King Nanyadeva in 1097.Presently it is a municipality of Nepal, located in Bara District, Province No. 2. Archaeological investigations of the fort also show that part of the walls extended into Bihar, India as the city was situated on the modern-day border. The municipality was created in 2014 by agglomerating the Village Development Committees of Amritganj, Golaganj, Hariharpur & Uchidih; and later on expanded to include Bhagwanpur, Kachorwa, Dewapur-Teta, and Bishunpur kamalpur.