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The Tarnovo Constitution (in Bulgarian Търновска конституция) was the first constitution of Bulgaria. It was adopted on 16 April 1879 (O.S.) by the Constituent National Assembly held in Veliko Tarnovo as part of the establishment of the Principality of Bulgaria. It remained the fundamental law of Bulgaria after the country was elevated to a kingdom in 1908. 
The constitution was bourgeois-liberal in character, and was considered very advanced for its time. It defined the functions and competences of the central organs of state authority according to the principle of separation of powers between an executive, a legislative, and a judiciary branch. Ministerial responsibility, immunity of the deputies, and inviolability of private property were also proclaimed. The constitution included a clause that formally established the Bulgarian Orthodox Church as the official religion of the nation.
With amendments in 1893 and 1911 that strengthened royal power, the Tarnovo Constitution remained in use until 4 December 1947, when it was replaced by the Dimitrov Constitution.
- "Конституция на българското княжество (законъ от 16 априлий 1879)", Сборник на действующите съдебни закони на княжеството (1878-1906), София: Официално издание на Министерството на Правосъдието, 1906
- Hertslet, Edward (1891), "Constitution of the Principality of Bulgaria", The Map of Europe by Treaty; which have taken place since the general peace of 1814. With numerous maps and notes, IV (1875-1891) (First ed.), London: Her Majesty's Stationery Office, pp. 2866–2776, retrieved 2012-12-25
- Chisholm, Hugh, ed. (1911). "Bulgaria/History". Encyclopædia Britannica (11th ed.). Cambridge University Press
- The text of the Constitution in Bulgarian at the site of the Bulgarian Parliament.
- Translation of the Constitution into English can be found in Wright, Herbert F., ed. (1919), "Bulgaria", The Constitutions of the States at War 1914-1918 (First ed.), Washington: Government Printing Office, pp. 87–104, retrieved 2012-12-24