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At the
heart of London lies the historic City of London, often referred to as
“the Square Mile.” As its nickname suggests, it covers roughly one
square mile (about 2.5 square kilometres). Once enclosed by ancient
walls, it began as the Roman settlement of Londinium and grew to become
the centre of trade and commerce in England. Today, it remains a unique
area with its own Lord Mayor and separate police force, reflecting its
long-standing independence and traditions.
For
centuries, the City itself was London—but rapid expansion from the
eighteenth century onwards transformed it into just one small part of a
much larger metropolis. As the population grew, development spread far
beyond the original boundaries. To the north, much of this expansion
took place within the historic county of Middlesex, while areas south
of the River Thames developed within Surrey and Kent.
Throughout
the nineteenth and twentieth centuries, London’s administrative
structure evolved significantly. New boroughs were created, and by 1900
the County of London brought together a large part of the urban area.
In 1965, further reorganisation led to the creation of Greater London,
incorporating surrounding districts and parts of neighbouring counties.
While administrative boundaries have changed over time, it’s important
to note that historic records—especially those dating from before the
twentieth century—are usually still held in the archives of the
original counties.
The
population of the City of London itself declined sharply during the
nineteenth century, as many residents moved out to expanding suburbs in
search of better living conditions. As a result, London family
histories often involve movement across multiple districts, boroughs,
and even counties.
Today, a
wide range of records relating to both the City and the wider
metropolitan area are held at The London Archives (formerly the London
Metropolitan Archives), located in the City of London. Additional
material can also be found in local borough archives, reflecting the
complex administrative history of the capital.
Tracing
London ancestors requires an understanding of these shifting boundaries
and patterns of migration. With the right expertise, it’s possible to
navigate this complexity and uncover the rich, layered story of your
family’s life in the capital.
The map
below shows the City of London in about 1830. Click on the map for a
larger version.
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