In the 18th century, Capuchin missionaries arrived in Nepal and served for 54 years in the Kathmandu valley. They were the earlier Christian missionaries after Jesuit missionaries in the history of Nepal. They were the first missionaries to establish churches in Nepal. However, after Prithivi Narayan Shah conquered the kingdoms of the valley in 1769 AD, missionaries were forced to leave the country due to concerns about foreign imperialism and the changing political situation. Scholars argue that King Prithivi Narayan Shah was anti-Christian, suspected of foreign imperialism and banished missionaries due to their friendly relationship with Malla kings. The expulsion of missionaries was influenced by the changing political scenario. This study confined on the historical study of capuchin missionaries in the Kathmandu valley, focusing on qualitative research design. It doesn't deal with other aspects of research.