The Queen , seeking the support of her own son 's claims to the throne over those of Surendra , invited Mathabar Singh Thapa back after almost six years in exile . Upon his arrival in Kathmandu , an investigation of his uncle 's death took place , and a number of his Pande enemies were massacred . As for Ranajang Pande , he had by that time contracted mental illness and would not have posed any threat to Mathabar . Nevertheless , Ranajang was paraded through the streets and made to witness the execution of his family members , after which he was forced to commit suicide by poison . By December 1843 , Mathabar Singh was appointed prime minister ; but after a year in power , he alienated both the King and the Queen by supporting Surendra 's claim over the throne . On 17 May 1845 , he was assassinated , on both the King and Queen 's orders , by his nephew , Jang Bahadur Kunwar . The death of Mathabar Singh ended the Thapa hegemony and set the stage for Kot massacre and the establishment of Rana Dynasty , a dictatorship of hereditary prime ministers , which was founded on the basic template provided by Bhimsen Thapa . These events provided the long period of stability the country needed but at the cost of political and economic development
Kot massacre
Kot massacre
Bhimsen Thapa