On June 4, 1913, Emily Wilding Davison stepped onto the track at the Epsom Derby during a race attended by the King of England and reached for the reins of his horse, Anmer.

She was struck by the horse and thrown to the ground. She never regained consciousness. She died four days later.

The footage is still watched today. What it shows is a woman walking deliberately onto a track, reaching up in a controlled motion, and being hit. Whether she intended to die or to attach a suffragette banner to the horse and survive the stunt is debated. She had a return train ticket in her pocket.

What is not debated: she was a militant suffragette who had been imprisoned nine times, forcibly fed during hunger strikes, and had twice concealed herself overnight in the Houses of Parliament on census night so her registered address would read "House of Commons" — women's rightful home.

The Women's Social and Political Union had been fighting for women's right to vote for years by 1913. It would take five more years, a world war, and the deaths of countless women before Parliament granted partial suffrage in 1918. Full equal suffrage came in 1928.

Davison's funeral procession drew 50,000 people lining the streets of London.