London

The City of London, affectionately known as the "Square Mile," is the historic core and primary financial district of London. Its origins trace back to 47 AD when the Romans established a trading settlement called Londinium on the northern banks of the River Thames. Thanks to its strategic riverside location, it quickly flourished into a bustling commercial hub. The Romans constructed the first London Bridge and encircled the settlement with a defensive wall, fragments of which are still visible today near the Museum of London and Tower Hill.

Following the Roman withdrawal in the 5th century, the area was largely abandoned until the Anglo-Saxons resettled it in the 9th century under Alfred the Great, restoring its defensive walls and re-establishing its trade networks. Following the Norman Conquest in 1066, William the Conqueror granted the City special privileges, recognizing its economic power, and began constructing the Tower of London just outside its eastern boundary to assert control over the independent-minded citizens. Throughout the Middle Ages, the City became a powerhouse of commerce, governed by powerful trade guilds and the Lord Mayor, an office established in 1189.

The 17th century brought profound tragedy and transformation. In 1665, the Great Plague decimated the population, followed immediately by the Great Fire of London in 1666, which started in a Pudding Lane bakery and destroyed over 80% of the City. The disaster paved the way for a massive reconstruction effort led by architect Sir Christopher Wren, who designed 51 new churches and his masterpiece, St. Paul's Cathedral.

During the Georgian and Victorian eras, the City's focus shifted almost entirely to finance and global trade. The establishment of the Bank of England in 1694 and the Royal Exchange cemented its status as the engine of the British Empire's economy.

In the 20th century, the City endured heavy bombing during the Blitz of World War II, leading to decades of rebuilding. Today, the Square Mile is a striking juxtaposition of ancient heritage and cutting-edge modernity. Historic landmarks like the Guildhall and the Monument stand in the shadows of iconic contemporary skyscrapers such as the Gherkin, the Cheesegrater, and the Walkie-Talkie. Despite its small residential population, it remains a global financial powerhouse, retaining its unique medieval governance and ceremonial traditions while driving the modern global economy.