Centuries: 10th century - 11th century - 12th century
- 1053 Malcolm III of Scotland invades Scotland
- A powerful supernova is observed. It was so bright that could be seen in daylight. The supernova remnant left by the event is now known as the Crab Nebula.
- Pope Leo IX and Michael Cerularius, Partiarch of Constantinople, decree each other's excommunication, finalising the Great Schism between the Catholic and Orthodox Churches.
- Malcolm Canmore begins his campaign for the throne of Scotland