City of London Corporation in the context of "Lord Mayor of London"

The City of London (often known as the City or the Square Mile) is a city, ceremonial county and local government district in England. Established by the Romans around 47 AD as Londinium, it forms the historic centre of the wider London metropolis. Surrounded by the modern ceremonial county of Greater London, from which it remains separate, the City is a unique local authority area governed by the City of London Corporation, which is led by the Lord Mayor of London; although it forms part of the region governed by the Greater London Authority.

Nicknamed the Square Mile, the City of London has an area of 1.12 sq mi (716.80 acres; 2.90 km), making it the smallest city in the United Kingdom. It had a population of 8,583 at the 2021 census, however over 500,000 people were employed in the area as of 2019.

Greater London is an administrative area in England, coterminous with the London region, containing most of the continuous urban area of London. It contains 33 local government districts: the 32 London boroughs, which form a ceremonial county also called Greater London, and the City of London. The Greater London Authority is responsible for strategic local government across the region, and regular local government is the responsibility of the borough councils and the City of London Corporation. Greater London is bordered by the ceremonial counties of Hertfordshire to the north, Essex to the north-east, Kent to the south-east, Surrey to the south, and Berkshire and Buckinghamshire to the west.

Greater London has a land area of 1,572 km (607 sq mi) and had an estimated population of 9,089,736 in 2024. The ceremonial county of Greater London is only slightly smaller, with an area of 1,569 km (606 sq mi) and a population of 9,074,625 in 2024. The area is almost entirely urbanised and contains the majority of the Greater London Built-up Area, which extends into Hertfordshire, Essex, Kent, Surrey, and Berkshire and in 2011 had a population of 9,787,426. None of the administrative area, region, or ceremonial county hold city status, but both the City of London and City of Westminster do. The area was historically part of Middlesex, Essex, Surrey, Kent and Hertfordshire.

Chennai, also known as Madras (its official name until 1996), is the capital and largest city of Tamil Nadu, the southernmost state of India. It is located on the Coromandel Coast of the Bay of Bengal. According to the 2011 Indian census, Chennai is the sixth-most-populous city in India and forms the fourth-most-populous urban agglomeration. Incorporated in 1688, the Greater Chennai Corporation is the oldest municipal corporation in India and the second oldest in the world after London.

Historically, the region was part of the Chola, Pandya, Pallava and Vijayanagara kingdoms during various eras. The coastal land which then contained the fishing village Madrasapattinam, was purchased by the British East India Company from the Nayak ruler Chennapa Nayaka in the 17th century. The British garrison established the Madras city and port and built Fort St. George, the first British fortress in India. The city was made the winter capital of the Madras Presidency, a colonial province of the British Raj in the Indian subcontinent. After India gained independence in 1947, Madras continued as the capital city of the Madras State and present-day Tamil Nadu. The city was officially renamed as Chennai in 1996.

Local government in England broadly consists of three layers: civil parishes, local authorities, and regional authorities. Every part of England is governed by at least one local authority, but parish councils and regional authorities do not exist everywhere. In addition, there are 31 police and crime commissioners, four police, fire and crime commissioners, and ten national park authorities with local government responsibilities. Local government is not standardised across the country, with the last comprehensive reform taking place in 1974.

Local authorities cover the entirety of England, and are responsible for services such as education, transport, planning applications, and waste collection and disposal. In two-tier areas a non-metropolitan county council and two or more non-metropolitan district councils share responsibility for these services. In single-tier areas a unitary authority, London borough, or metropolitan borough provides all services. The City of London and Isles of Scilly have unique local authorities.

Hampstead Heath is an ancient heath in London, spanning 320 hectares (790 acres). This grassy public space sits astride a sandy ridge, one of the highest points in London, running from Hampstead to Highgate, which rests on a band of London Clay. The heath is rambling and hilly, embracing ponds, recent and ancient woodlands, a lido, playgrounds, and a training track, and it adjoins the former stately home of Kenwood House and its estate. The south-east part of the heath is Parliament Hill, from which the view over London is protected by law.

Running along its eastern perimeter is a chain of ponds – including three open-air public swimming pools – which were originally reservoirs for drinking water from the River Fleet. The heath is a Site of Metropolitan Importance for Nature Conservation, and part of Kenwood is a Site of Special Scientific Interest. Lakeside concerts are held there in summer. The heath is managed by the City of London Corporation, and lies mostly within the London Borough of Camden, with the adjoining Hampstead Heath Extension and Golders Hill Park in the London Borough of Barnet.

Guildhall is a municipal building in the City of London, England. It is off Gresham and Basinghall streets, in the wards of Bassishaw and Cheap. The current building dates from the 15th century; however documentary evidence suggests that a guildhall had existed at the site since at least the early 12th century. The building has been used as a town hall for several hundred years, and is still the ceremonial and administrative centre of the City of London and its Corporation. It should not be confused with London's City Hall, the administrative centre for Greater London in Canning Town. The term "Guildhall" refers both to the whole building and to its main room, which is a medieval great hall. It is a Grade I-listed building.

A livery company is a type of guild or professional association that originated in medieval times in London, England. Livery companies comprise London's ancient and modern trade associations and guilds, almost all of which are styled the "Worshipful Company of" their craft, trade or profession. There are 113 livery companies as of March 2025. They play a significant part in the life of the City of London, not least by providing charitable-giving and networking opportunities. Liverymen retain voting rights for the senior civic offices, such as the Lord Mayor and Sheriffs of the City Corporation, London's ancient municipal authority with extensive local government powers.

The term livery originated in the designed form of dress worn by retainers of a nobleman and then by extension to special dress to denote status of belonging to a trade. Livery companies evolved from London's medieval guilds, becoming corporations by royal charter responsible for training in their trades, as well as for the regulation of aspects such as wage control, labour conditions and industry standards. Early guilds often grew out of parish fraternal organizations, where numerous members of the same trade lived in close proximity often congregating at the same church. Like most organisations during the Middle Ages, these livery companies had close ties with the Roman Catholic Church (before the Protestant Reformation), endowing religious establishments such as chantry chapels and churches, observing religious festivals and hosting ceremonies as well as well-known mystery plays. Most livery companies retain their historical religious associations, although nowadays members are free to follow any faith or none.