Empire in the context of "Nomadic empire"

Several empires in human history have been contenders for the largest of all time, depending on definition and mode of measurement. Possible ways of measuring size include area, population, economy, and power. Of these, area is the most commonly used because it has a relatively precise definition and can be feasibly measured with some degree of accuracy; nevertheless, even area is limited in this regard because of the difficulty in defining the boundaries of empires due to things like the indirect nature of imperial control and sparsely inhabited or even uninhabited areas that may nominally have been controlled by an empire but not meaningfully ruled by it.

Estonian political scientist Rein Taagepera, who published a series of academic articles about the territorial extents of historical empires between 1978 and 1997, and a book in 2024, defined an empire in this context as "any relatively large sovereign political entity whose components are not sovereign" and its size as the area over which the empire has some undisputed military and taxation prerogatives. The list is not exhaustive as there is a lack of available data for several empires; for this reason and because of the inherent uncertainty in the estimates, no rankings are given.

Ancient warfare is war that was conducted from the beginning of recorded history to the end of the ancient period. The difference between prehistoric and ancient warfare is more organization oriented than technology oriented. The development of first city-states, and then empires, allowed warfare to change dramatically. Beginning in Mesopotamia, states produced sufficient agricultural surplus. This allowed full-time ruling elites and military commanders to emerge. While the bulk of military forces were still farmers, the society could portion off each year. Thus, organized armies developed for the first time. These new armies were able to help states grow in size and become increasingly centralized.

In Europe and the Near East, the end of antiquity is often equated with the Fall of Rome in 476 AD, the wars of the Eastern Roman Empire on its Southwestern Asian and North African borders, and the beginnings of the Muslim conquests in the 7th century. In China, it can also be seen as ending of the growing role of mounted warriors needed to counter the ever-growing threat from the north in the 5th century and the beginning of the Tang dynasty in 618 AD. In India, the ancient period ends with the decline of the Gupta Empire (6th century) and the beginning of the Muslim conquests there from the 8th century. In Japan, the ancient period is considered to end with the rise of feudalism in the Kamakura period in the 12–13th century.

The Middle Assyrian Empire was the third stage of Assyrian history, covering the history of Assyria from the accession of Ashur-uballit I c. 1363 BC and the rise of Assyria as a territorial kingdom to the death of Ashur-dan II in 912 BC. The Middle Assyrian Empire was Assyria's first period of ascendancy as an empire. Though the empire experienced successive periods of expansion and decline, it remained the dominant power of northern Mesopotamia throughout the period. In terms of Assyrian history, the Middle Assyrian period was marked by important social, political and religious developments, including the rising prominence of both the Assyrian king and the Assyrian national deity Ashur.

The Middle Assyrian Empire was founded through Assur, a city-state through most of the preceding Old Assyrian period, and the surrounding territories achieving independence from the Mitanni kingdom. Under Ashur-uballit, Assyria began to expand and assert its place as one of the great powers of the Ancient Near East. This aspiration chiefly came into fruition through the efforts of the kings Adad-nirari I (r. c. 1305–1274 BC), Shalmaneser I (r. c. 1273–1244 BC) and Tukulti-Ninurta I (r. c. 1243–1207 BC), under whom Assyria expanded to for a time become the dominant power in Mesopotamia. The reign of Tukulti-Ninurta I marked the height of the Middle Assyrian Empire and included the subjugation of Babylonia and the foundation of a new capital city, Kar-Tukulti-Ninurta, though it was abandoned after his death. Though Assyria was left largely unscathed by the direct effects of the Late Bronze Age collapse of the 12th century BC, the Middle Assyrian Empire began to experience a significant period of decline roughly at the same time. The assassination of Tukulti-Ninurta I c. 1207 BC led to inter-dynastic conflict and a significant drop in Assyrian power.

The Russian Empire was an empire that spanned 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 km (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.

From the 10th to 17th century, the Russians had been ruled by a noble class known as the boyars, above whom was the tsar, the absolute monarch. The groundwork of the Russian Empire was laid by Ivan III who ruled from 1462 to 1505, and greatly expanded his domain, established a centralized Russian national state, and secured independence against the Tatars. His grandson, Ivan IV (r. 1533–1584), became in 1547 the first Russian monarch to be crowned tsar of all Russia. Between 1550 and 1700, the Russian state grew by an average of 35,000 km (14,000 sq mi) per year. Peter I transformed the tsardom into an empire, and fought numerous wars that turned a vast realm into a major European power. He moved the Russian capital from Moscow to the new model city of Saint Petersburg, and led a cultural revolution that introduced a modern, scientific, rationalist, and Western-oriented system. Catherine the Great (r. 1762–1796) presided over further expansion of the Russian state by conquest, colonization, and diplomacy, while continuing Peter's policy of modernization. Alexander I (r. 1801–1825) helped defeat the militaristic ambitions of Napoleon and subsequently constituted the Holy Alliance, which aimed to restrain the rise of secularism and liberalism across Europe. Russia further expanded to the west, south, and east, strengthening its position as a European power. Its victories in the Russo-Turkish Wars were later checked by defeat in the Crimean War (1853–1856), leading to a period of reform and conquests in Central Asia. Alexander II (r. 1855–1881) initiated numerous reforms, most notably the 1861 emancipation of all 23 million serfs.

Imperialism is the maintaining and extending of power over foreign nations, particularly through expansionism, employing both hard power (military and economic power) and soft power (diplomatic power and cultural imperialism). Imperialism focuses on establishing or maintaining hegemony and a more formal empire.

While related to the concept of colonialism, imperialism is a distinct concept that can apply to other forms of expansion and many forms of government.

An emperor (from Latin: imperator, via Old French: empereor) is the (male) ruler of an empire. Empress, the female equivalent, may indicate an emperor's wife (empress consort), mother/grandmother (empress dowager/grand empress dowager), or a woman who rules in her own right and name (empress regnant or suo jure). Emperors are generally recognized to be of the highest monarchic honour and rank, surpassing king. In Europe, the title of Emperor has been used since the Middle Ages, considered in those times equal or almost equal in dignity to that of Pope due to the latter's position as visible head of the Church and spiritual leader of the Catholic part of Western Europe. The emperor of Japan is the only currently reigning monarch whose title is translated into English as "Emperor", although he no longer reigns over an empire.

Both emperors and kings are monarchs or sovereigns, both emperor and empress are considered monarchical titles. In as much as there is a strict definition of emperor, it is that an emperor has no relations implying the superiority of any other ruler and typically rules over more than one nation. Therefore, a king might be obliged to pay tribute to another ruler, or be restrained in his actions in some unequal fashion, but an emperor should in theory be completely free of such restraints. However, monarchs heading empires have not always used the title in all contexts—the British sovereign did not assume the title Empress of the British Empire even during the incorporation of India, though she was declared Empress of India.

The Delhi Sultanate or the Sultanate of Delhi was a late medieval empire primarily based in Delhi that stretched over large parts of the Indian subcontinent for more than three centuries. The sultanate was established in 1206 in the former Ghurid territories in India. The sultanate's history is generally divided into five periods: Mamluk (1206–1290), Khalji (1290–1320), Tughlaq (1320–1414), Sayyid (1414–1451), and Lodi (1451–1526). It covered large swaths of territory in modern-day India, Pakistan, Bangladesh, as well as some parts of southern Nepal.

The foundation of the Sultanate was established by the Ghurid conqueror Muhammad Ghori, who routed the Rajput Confederacy, led by Ajmer ruler Prithviraj Chauhan, in 1192 near Tarain in a reversal of an earlier battle. As a successor to the Ghurid dynasty, the Delhi Sultanate was originally one of several principalities ruled by the Turkic slave-generals of Muhammad Ghori, including Taj al-Din Yildiz, Qutb ud-Din Aibak, Bahauddin Tughril and Nasir ad-Din Qabacha, that had inherited and divided the Ghurid territories amongst themselves. Khalji and Tughlaq rule ushered a new wave of rapid and continual Muslim conquests deep into South India. The sultanate finally reached the peak of its geographical reach during the Tughlaq dynasty, occupying most of the Indian subcontinent under Muhammad bin Tughluq. A major political transformation occurred across North India, triggered by the Central Asian king Timur's devastating raid on Delhi in 1398, followed soon afterwards by the re-emergence of rival Hindu powers such as Vijayanagara Empire and Kingdom of Mewar asserting independence, and new Muslim sultanates such as the Bengal and Bahmani Sultanates breaking off. In 1526, Timurid ruler Babur invaded northern India and conquered the Sultanate, leading to its succession by the Mughal Empire.

A great power is a nation, state or empire that, through its economic, political and military strength, is able to exert power and influence not only over its own region of the world, but beyond to others. A great power typically possesses military, economic, and diplomatic strength that it can wield to influence the actions of middle or small powers.

In a modern context, recognized great powers first arose in Europe during the post-Napoleonic era. The formalization of the division between small powers and great powers came about with the signing of the Treaty of Chaumont in 1814.