Greater Nepal is a concept of Nepal extending beyond its present boundaries to include present day Indian territories controlled briefly by the Gorkhali army after unification campaign by Prithvi Narayan Shah fought from 1791 to 1804 but ceded to the East India Company under the Sugauli Treaty, after the Gorkhalis were defeated in the 1814–16 Anglo-Nepalese War. In 1813, the historical Greater Nepal extended from the Sutlej to the Teesta, spanning 1500 kilometres. Rule over this expanse was brief, however, and in the aftermath of the 1814-1815 war with the East India Company the Gorkhali realm was whittled down considerably. The real time Gorkhali presence in Garhwal was for over a decade; Kumaon for 25 years; and Lower Part of Sikkim for 33 years. The Treaty of Sugauli, between the Gorkhali king and the Company, was ratified in 1816. It caused Nepal to lose about 105,000 km2 of territory and left Nepal as she is today, with 147,181 km2 of present total area.
King Prithvi Narayan Shah (1723–75) of the Shah dynasty decided to enlarge the kingdom that was confined to the small Gorkha region of Nepal and had an area of just 2,500 square kilometres (970 sq mi). He defeated major principalities in wars and unified them under his rule starting from the 1740s ending with shifting of his Gorkha Kingdom’s capital from Gorkha region to Kathmandu in 1769. He then attacked and absorbed dozens of other small principalities of Nepal area to his Gorkha kingdom. After his death in 1775, his eldest son Pratap Singh Shah continued defeating other smaller princes and absorbing their fiefdoms. Pratap Shah died at the age of twenty-five in 1777. Then Prithvi Narayan Shah’s second son, Bahadur Shah, ruled until 1794.