Former Christian states

Sweden, formally the Kingdom of Sweden, is a Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east, and shares a maritime border with Denmark to the south. At , Sweden is the largest Nordic country by both area and population, and is the fifth-largest country in Europe. Its capital and largest city is Stockholm. Sweden has a population of 10.6 million, and a low population density of ; 88% of Swedes reside in urban areas. They are mostly in the central and southern half of the country. Sweden's urban areas toge

Roman Empire during Late Antiquity and the Middle Ages

multi-ethnic complex of territories in Western and Central Europe (800/962–1806)

The Russian Empire was the final period of the Russian monarchy, spanning most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about 22,800,000 km2 (8,800,000 sq mi), roughly one-sixth of the world's landmass, making it the third-largest empire in history, behind only the British and Mongol empires. It also colonized Alaska between 1799 and 1867. The empire's 1897 census, the only one it conducted, found a population of 125.6 million with considerable ethnic, linguistic, religious, and socioeconomic diversity.

Austria-Hungary, also referred to as the Austro-Hungarian Empire and officially as the Austro-Hungarian Monarchy, was a multi-national constitutional dual empire in Central Europe between 1867 and 1918. A military and diplomatic alliance, it consisted of two sovereign states with a single monarch who was titled both the Emperor of Austria and the Apostolic King of Hungary. Austria-Hungary constituted the last phase in the constitutional evolution of the Habsburg monarchy: it was formed with the Austro-Hungarian Compromise of 1867 in the aftermath of the Austro-Prussian War, following wars of i

colonial empire governed by Spain between 1492 and 1976

Central European multinational Empire from 1804 to 1867

historical multinational monarchist state in Eastern Europe (Crown of the Kingdom of Poland and the Grand Duchy of Lithuania)

former country in North America formed by the Southern United States during the American Civil War (1861-1865)

independently administered western provinces of the Roman Empire

former state (697–1797) controlling, at various times, parts of northeastern Italy, the Balkans, and Mediterranean islands

historic kingdom on the British Isles (927–1649; 1660–1707)

constitutional monarchy in Western Europe (1707–1800)

territories mostly in the Appenine Peninsula under the sovereign direct rule of the pope between 756–1870

former European state (1701–1918), part of the German Empire after 1871

global empire centered in Portugal (1415–1999)

kingdom in Western Europe (987–1792; 1815–1848)

predecessor state of the Netherlands (1581–1795)

Russian state from 1547 to 1721

state in Southern Europe from 1324 to 1861

Italian state (1282–1816)

medieval Christian kingdom in the Middle East

monarchy in Europe (1282–1918)

Russian principality (1263–1547)

historic sovereign kingdom on the British Isles from the 9th century and up to 1707

trading nation in the area of Eritrea and Northern Ethiopia

medieval and early modern maritime republic from (1005-1797)

state formed from the kingdoms of Sicily and Naples (1815–1861)

The Kingdom of the West Saxons, also known as the Kingdom of Wessex, was an Anglo-Saxon kingdom in the south of Great Britain, from around 519 until Alfred the Great declared himself as King of the Anglo-Saxons in 886.

former state in southern Italy, 1130–1816

Central European monarchy (1000–1946)

1270–1974 state in the Horn of Africa

medieval and early modern kingdom in the Iberian Peninsula (1035-1707)

medieval Bulgar-Slavic and later Bulgarian state that existed in Southeastern Europe between the 7th and 11th centuries AD.

kingdom on the island of Ireland between 1542 and 1801

Period of Germanic rule on the Iberian Peninsula (418–720) as a successor state to the Western Roman Empire.

European sovereign state (1065–1230)

composite monarchy which existed between 1162–1716

successor state of the Byzantine Empire when the crusaders conquered Constantinople at Fourth Crusade of 1204

former kingdom on the Iberian Peninsula

historical country of the 12th–15th centuries in modern-day Russia

empire in South America between 1822 and 1889

Basque medieval kingdom that occupied lands on either side of the western Pyrenees, alongside the Atlantic Ocean (1162–1512)

monarchy in Central Europe, predecessor of modern Czech Republic

Byzantine Greek state on Black Sea coast

kingdom in Southeastern Europe between 1881 and 1947

1882–1918 kingdom in Southeastern Europe

period of Greek statehood from 1832 to 1924 and 1935 to 1973

Christian states in the Levant, 1098–1291

kingdom in Southwestern Europe (1139–1910)

former duchy in Italy (1395–1447; 1450–1796)

ancient state of Armenia

1910–1918 kingdom in Southeastern Europe

former Italian state (1569–1801; 1815–1859)

city-state on the Appenine Peninsula between 1115–1532/69

German kingdom established in 1814

Medieval Bulgarian state (1185–1396)

state on the Balkan Peninsula between 1908 and 1946

former German state (1806-1918)

1939–1945 client state of Nazi Germany