21OCTOBER

ON THIS DAY

What happened on October 21?

October 21 joins a famous naval victory with the development of practical electric lighting, women’s first national vote in France and the Aberfan disaster.

4 researched moments · 4 themes · reviewed September 2026

4 moments shown

1805

The Battle of Trafalgar was fought

A British fleet commanded by Admiral Horatio Nelson defeated combined French and Spanish fleets off the coast of Spain.

1879

Thomas Edison tested a durable incandescent lamp

Edison’s laboratory successfully tested a carbon-filament electric lamp that continued burning into the following day.

1945

Women voted in a French national election for the first time

French women participated in the election for a Constituent Assembly, months after first voting in municipal elections.

1966

The Aberfan disaster occurred

A colliery spoil tip collapsed onto the Welsh village of Aberfan, engulfing a school and nearby homes.

A LIVING COLLECTION

This date can keep growing.

History is wider than any first selection. We can add well-sourced events, people and perspectives while keeping every entry in chronological order.

Suggest a correction or addition

A LITTLE SPACE FOR WHAT MATTERS

Life has a lot of dates. Give yours a home.

Your people, your plans and the things you want to remember.

Request your invite