Baptism of Poland
Mieszko I adopts Latin Christianity and founds Polish statehood

Duke Mieszko I of the Piast dynasty was baptised in the Latin rite, probably on 14 April 966. The event is regarded as the birth of the Polish state and drew Poland into Western Christendom.
Wikipedia (English) · 10th century
Meanwhile around the world (±25 years)
Europe
- 962 Coronation of Otto I — 4 years earlier
Africa
- 969 Founding of Cairo — 3 years later
- 972 Al-Azhar Mosque opens — 6 years later
Asia
- 946 Millennium Eruption of Mount Paektu — 20 years earlier
- 960 Founding of the Song dynasty — 6 years earlier
Americas
- c. 950–1250 Medieval Warm Period — 16 years earlier
Alive at the time
- Vladimir the Great (aged 6)
- Otto the Great (aged 54)
- Olga of Kiev (aged 46)
- Ferdowsi (aged 26)
- Hugh Capet (aged 26)
- Æthelred the Unready (aged 0)
- Sviatoslav I (aged 24)
- Edgar the Peaceful (aged 23)
- Otto II (aged 11)
- Yaropolk I (aged 11)