What happened on 25 January?

6 events from the Ever-When timeline, ranked by how much they mattered.

1. 750 Abbasid Caliphate founded Overthrow of the Umayyad Caliphate; capital moves to Baghdad; opens the Islamic Golden Age.
2. 2011 Egyptian Revolution of 2011 Eighteen days of Cairo protests force Hosni Mubarak's resignation after 30 years; brief democratic opening before counter-coup.
3. 1077 Walk to Canossa Emperor Henry IV stands barefoot in the snow at Canossa to beg Pope Gregory VII's absolution; emblem of the Investiture struggle.
4. 1533 Henry secretly marries Anne Boleyn With Anne pregnant and Rome still stalling, Henry marries her in a dawn ceremony so secret the officiating chaplain's identity is still disputed — months before any court has annul
5. 1882 Born: Virginia Woolf English Modernist novelist of Mrs Dalloway and To the Lighthouse; founding figure of feminist criticism.
6. 1971 Idi Amin seizes power in Uganda A military coup brings Idi Amin to power; his eight-year dictatorship kills hundreds of thousands.