The disaster that occurred in London in 1666, resulting in widespread fire destruction, was the Great Fire of London. It began on September 2, 1666, in a bakery on Pudding Lane and swiftly spread, fueled by wooden structures and a dry summer. Lasting four days, the fire devastated a large portion of the city, destroying approximately 13,200 houses, along with notable landmarks such as St. Paul's Cathedral. The catastrophic event led to significant changes in building regulations, urban planning, and fire safety measures, ultimately reshaping London's architectural landscape in the years that followed.