s began the reputation of "Gurkhas" as fierce and ruthless soldiers. The war ended in the Treaty of Sugauli, under which Nepal ceded recently captured portions of Sikkim and lands in Terai as well as the right to recruit soldiers.
Factionalism inside the royal family had led to a period of instability. In 1846 a plot was discovered revealing that the reigning queen had planned to overthrow Jung Bahadur Kunwar, a fast-rising military leader. This led to the Kot Massacre; armed clashes between military personnel and administrators loyal to the queen led to the execution of several hundred princes and chieftains around the country. Jung Bahadur Kunwar emerged victorious and founded the Rana Lineage and was later known as Jung Bahadur Rana.
The king was made a titular figure, and the post of Prime Minister was made powerful and hereditary. The Ranas were staunchly pro-British and assisted them during the Indian Sepoy Rebellion in 1857 (and later in both World Wars). Some parts of the Terai Region were given back to Nepal by the British as a friendly gesture, because of her military help to sustain British control in India during the Sepoy Rebellion. In 1923, the United Kingdom and Nepal formally signed an agreement of friendship, which superseded the Sugauli Treaty signed in 1816.
Slavery was abolished in Nepal in 1924. Nevertheless debt bondage even involving debtors' children has been a persistent social problem in the Terai.
In the late 1940s, newly emerging pro-democracy movements and political parties in Nepal were critical of the Rana autocracy. Meanwhile, with the invasion of Tibet by China in the 1950s, India sought to counterbalance the perceived military threat from its northern neighbour by taking pre-emptive steps to assert more influence in Nepal. India sponsored both King Tribhuvan (ruled 1911–55) as Nepal's new ruler in 1951 and a new government, mostly comprising the Nepali Congress Party, thus terminating Rana hegemony in
