Nepal was divided into many small states in the past. There was not a single country called Nepal. At that time all those small states were called Baise & Chaubise Rajya. The work of unity was started by king Prithivi Narayan Shah of Gorkha.

king Drabya Shah (youngest son of King Yashobrahma Shah of Lamjung) defeated Khadkas of Gorkha and became the King of Gorkha. His 11th generation King PN Shah started the work of Unity. The remaining works of Unity was done by Bahadur Shah (youngest son of King PN shah). The main peoples to contribute and to spend their whole life for the unity of Nepal were: Bhimsen Thapa, Balbhadra Kunwar, Kalu Pade and others.

The 1st Shah king is Kulmandan Shah. He was the king of Lamjung District. King Yashobrahma Shah the generation of Kulmandan Shah had two sons Narhari Shah and Drabya Shah. Narhari Shah became Crown Prince and Drabya Shah was send to look the animals of the Royal Family. Slowly Drabya Shah also wanted to become a king. With his supporters he defeated Khadkas of Gorkha and became the king of Gorkha. After Drabya Shah became King of Gorkha his brother Narhari Shah did not like this and he kept the proposal of making Gorkha and Lamjung a single country but Drabya Shah rejected. There was always a war between Gorkha and Lamjung. Later the mother of the both kings solved the problem between two brothers but the relation was not good between two brothers.

Gorkha was strong than Lamjung. King Ram Shah the generation of Drabya Shah make the Gorkha more famous by giving equal rights to all the peoples. King Narbhupal Shah had two sons. His 1st son died when he was a child and Prithivi Narayan Shan became Crown Prince of Gorkha.

Prithivi Narayan Shah became King of Gorkha in 1825 BS he started visiting different parts of Baise and Chaubise Rajya, he specially visited Kathmandu Valley. He was very clever also. He started thinking that if he wins Kathmandu Valley then business with Tibet can be expanded and Gorkha can be a rich. Then he started contributing small states and make a single country. He 1st attack Nuwakot but he was failed. In the third attack he became success. Then he contributed Kathmandu Valley in Gorkha. King Prithivi Narayan Shah is known as 1st king of Nepal and he is symbol of UNITY. His life finished fighting with different small states. His son Bahadur shah continued the work of unity after the death of Prithivi Narayan Shah.

The other kings of Nepal were useless and they all enjoyed the power of king. The remaining work of Unity was done by Bhimsen Thapa, Balbhadra Kunwar etc.