A capital city (or just, capital) is the area of a country, province, region, or state considered to enjoy primary status; although there are exceptions, a capital is typically a city that physically encompasses the offices and meeting places of the seat of government and is usually fixed by law or by the constitution. An alternative term is political capital, but this phrase has a second meaning based on an alternate sense of the word capital. The capital is often, but not necessarily, the largest city of its constituent area.

The word capital derives from the Latin caput meaning "head".

The seats of government in major sub-state jurisdictions are often called "capitals," but this is typically only the case in countries with some degree of federalism, where major sub-state legal jurisdictions have elements of sovereignty. In unitary states, an "administrative centre" or other similar term is typically used for such locations besides the national capital city. For example, the seat of government in a state of the United States is usually called its "capital", but the main city in a region of the United Kingdom is usually not called such, even though in Ireland, a county's main town is usually called its "capital". On the other hand, the four countries of the United Kingdom do have capital cities: Scotland – Edinburgh, Wales – Cardiff, Northern Ireland – Belfast, and England – London. Counties in England, Wales and Scotland have historic county towns, which are often not the largest settlement within the county and often are no longer administrative centres, as many historical counties are now only ceremonial, and administrative boundaries are different.

Capital may refer to:

Karl Heinrich Marx (5 May 1818 – 14 March 1883) was a German philosopher, economist, sociologist, historian, journalist, and revolutionary socialist. His ideas played a significant role in the development of social science and the socialist political movement. He published various books during his lifetime, with the most notable being The Communist Manifesto (1848) and Capital (1867–1894); some of his works were co-written with his friend and fellow German revolutionary socialist, Friedrich Engels.

Born into a wealthy middle class family in Trier, formerly in Prussian Rhineland now called Rhineland-Palatinate, Marx studied at both the University of Bonn and the University of Berlin, where he became interested in the philosophical ideas of the Young Hegelians. In 1836, he became engaged to Jenny von Westphalen, marrying her in 1843. After his studies, he wrote for a radical newspaper in Cologne, and began to work out his theory of dialectical materialism. Moving to Paris in 1843, he began writing for other radical newspapers. He met Engels in Paris, and the two men worked together on a series of books. Exiled to Brussels, he became a leading figure of the Communist League, before moving back to Cologne, where he founded his own newspaper. In 1849 he was exiled again and moved to London together with his wife and children. In London, where the family was reduced to poverty, Marx continued writing and formulating his theories about the nature of society and how he believed it could be improved, and also campaigned for socialism—he became a significant figure in the International Workingmen's Association.