List of largest cities throughout history in the context of "London"

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Chang'an, located in China's Shaanxi Province, was the capital city of several Chinese dynasties, including the Western Han and the Tang, from 202 BC to AD 907. At various times, it was the largest city in the world. Its name was subsequently changed, and during the Ming dynasty period its modern name of Xi'an was adopted.

Throughout most of its history, Istanbul has ranked among the largest cities in the world. By 500 CE, Constantinople had somewhere between 400,000 and 500,000 people, edging out its predecessor, Rome, for world's largest city. Constantinople jostled with other major historical cities, such as Baghdad, Chang'an, Kaifeng and Merv for the position of world's most populous city until the 12th century. It never returned to being the world's largest, but remained Europe's largest city from 1500 to 1750, when it was surpassed by London.

The Turkish Statistical Institute estimates that the population of Istanbul Metropolitan Municipality was 15,701,602 at the end of 2024, hosting 18 percent of the country's population. Then about 97–98% of the inhabitants of the metropolitan municipality were within city limits, up from 89% in 2007 and 61% in 1980. 64.9% of the residents live on the European side and 35.1% on the Asian side. While the city ranks as the world's 5th-largest city proper, it drops to the 24th place as an urban area and to the 18th place as a metro area because the city limits are roughly equivalent to the agglomeration. Today, it forms one of the largest urban agglomerations in Europe, alongside Moscow. The city's annual population growth of 3.45 percent ranks as the highest among the seventy-eight largest metropolises in the Organisation for Economic Co-operation and Development. The high population growth mirrors an urbanization trend across the country, as the second and third fastest-growing OECD metropolises are the Turkish cities of İzmir and Ankara.

During the 19th century, London grew enormously to become a global city of immense importance. It was the largest city in the world from about 1825, the world's largest port, and the heart of international finance and trade. Railways connecting London to the rest of Britain, as well as the London Underground, were built, as were roads, a modern sewer system and many famous sites.

Mosul is a major city in northern Iraq, serving as the capital of Nineveh Governorate. It is the second largest city in Iraq overall after the capital Baghdad. Situated on the banks of Tigris, the city encloses the ruins of the ancient Assyrian city of Nineveh—once the largest city in the world—on its east side.

Due to its strategic and central location, the city has traditionally served as a hub of international commerce and travel in the region. It is considered as one of the historically and culturally significant cities of the Arab world. The North Mesopotamian Arabic spoken in Mosul is known as Maslawi and is widely spoken in the region. Together with the Nineveh Plains, Mosul is a historical center of the Assyrians. The surrounding region is ethnically and religiously diverse; a large majority of the city is Arabs, with Kurds, Assyrians, Turkmens, Shabaks, and other minorities comprising the population. Sunni Islam is the largest religion but there are a sizeable number of Christians and Yazidis as well as adherents of other Muslim sects such as Twelver Shi'ism and Shabakism, and in the past, Iraqi Jews. Mosul and its surrounding region are significant in biblical history.

Nineveh was an ancient Near Eastern city of Upper Mesopotamia, located in the modern-day city of Mosul in northern Iraq. It is located on the eastern bank of the Tigris River and was the capital and largest city of the Neo-Assyrian Empire—and potentially the wealthiest city in the ancient world. Today, it is a common name for the half of Mosul that lies on the eastern bank of the Tigris, and the country's Nineveh Governorate takes its name from it.

It was the largest city in the world for approximately fifty years until the year 612 BC when, after a bitter period of civil war in Assyria, it was sacked by a coalition of its former subject peoples including the Babylonians, Medes, and Scythians. The city was never again a political or administrative centre, but by Late Antiquity it was the seat of an Assyrian Christian bishop of the Assyrian Church of the East. It declined relative to Mosul during the Middle Ages and was mostly abandoned by the 14th century AD after the massacres and dispersal of Assyrian Christians by Timur.

Ctesiphon (/ˈtɛsɪfɒn/ TESS-if-on; Middle Persian: 𐭲𐭩𐭮𐭯𐭥𐭭, Tyspwn or Tysfwn; Persian: تیسفون; Ancient Greek: Κτησιφῶν, Attic Greek: [ktɛːsipʰɔ̂ːn]; Syriac: ܩܛܝܣܦܘܢ) was an ancient city in modern Iraq, on the eastern bank of the Tigris, about 35 kilometres (22 mi) southeast of Baghdad. Ctesiphon served as a royal capital of the Iranian empires for over eight hundred years, in the Parthian and Sasanian periods. Ctesiphon was the administrative capital of the Sasanian Empire from 226 to 637 (when it was conquered by the Arabs), or until the conclusion of the Muslim conquest of Persia in 651 AD.

Ctesiphon developed into a rich commercial metropolis, merging with the surrounding cities along both shores of the river, including the Hellenistic city of Seleucia. Ctesiphon and its environs were therefore sometimes referred to as "The Cities" (Mahuza, Arabic: المدائن, romanized: al-Mada'in). In the late 6th and early 7th century, it was listed as the largest city in the world by some accounts.

Harappa (Punjabi pronunciation: [ɦəɽəˈpaː]) is an archaeological site in Punjab, Pakistan, about 24 kilometres (15 miles) west of Sahiwal, that takes its name from a modern village near the former course of the Ravi River. The Ravi now runs eight kilometres (five miles) to the north.

The city of Harappa is believed to have had as many as 23,500 residents and occupied about 150 hectares (370 acres) with clay brick houses at its greatest extent during the Mature Harappan phase (2600 BC – 1900 BC), which is considered large for its time.

Pataliputra (IAST: Pāṭaliputra), adjacent to modern-day Patna, Bihar, was a city in ancient India, originally built by Magadha ruler Ajatashatru in 490 BCE, as a small fort (Pāṭaligrāma) near the Ganges river. Udayin laid the foundation of the city of Pataliputra at the confluence of two rivers, the Son and the Ganges. He shifted his capital from Rajgriha to Pataliputra due to the latter's central location in the empire.

It became the capital of major powers in ancient India, such as the Shishunaga Empire (c. 413–345 BCE), Nanda Empire (c. 460 or 420 – c. 325 BCE), the Maurya Empire (c. 320–180 BCE), the Gupta Empire (c. 320–550 CE), and the Pala Empire (c. 750–1200 CE). During the Maurya period (see below), it became one of the largest cities in the world. As per the Greek diplomat, traveler and historian Megasthenes, during the Mauryan Empire (c. 320–180 BCE) it was among the first cities in the world to have a highly efficient form of local self government.The location of the site was first identified in modern times in 1892 by Laurence Waddell, published as Discovery of the Exact Site of Asoka's Classic Capital. Extensive archaeological excavations have been made in the vicinity of modern Patna. Excavations early in the 20th century around Patna revealed clear evidence of large fortification walls, including reinforcing wooden trusses.