what happened in 1666

In 1666, the most famous event was the Great Fire of London , a catastrophic blaze that destroyed much of the City of London between 2–5 September.

Great Fire of London

• The fire started in a bakery on Pudding Lane in the early hours of 2 September 1666 and spread rapidly through the crowded wooden houses.

• It destroyed a large part of the medieval city, including old St Paul’s Cathedral, many civic buildings, 87 parish churches, and around 13,000 houses.

• Despite the scale of destruction, reported direct deaths were surprisingly low, though modern historians suspect undercounting of poorer victims.

War and politics

• 1666 fell during the Second Anglo-Dutch War, with major naval battles such as the Four Days’ Battle and St James’s Day Battle between England and the Dutch Republic.

• England’s royal court had only just returned to London that year as the Great Plague of 1665 subsided, so the city was still recovering from epidemic disease when the fire hit.

Science and ideas

• 1666 is sometimes called the “annus mirabilis” of Isaac Newton; while at the University of Cambridge’s Trinity College (and during plague closures), he developed early ideas on calculus, optics, and gravitation, though much of this work was written up later.

Other notable 1666 events

• Major battles and rebellions occurred in Europe, including engagements in the Polish–Lithuanian Commonwealth such as the Battle of Matwy.

• In the wider world, dynastic changes took place like the succession of Sam Mirza as Safavid ruler in Persia after the death of Shah Abbas II.

Overall, when people ask “what happened in 1666,” they are usually referring to the Great Fire of London and, more broadly, to a year marked by war, urban disaster, and important scientific advances.