Events relating to religion
The Byzantine empire enjoys a revival, bringing the Slavs within the Greek Orthodox fold and winning victories against the Muslims
Harald Bluetooth is baptized a Christian and unites the whole of Denmark as a single kingdom.
The imperial coronation of Otto I by Pope John XII in St Peter's puts in place the formal role of a Holy Roman emperor
Mieszko, pagan chieftain of the Poles, marries a Christian Czech princess and brings all his people into the Roman Catholic fold
The Hungarian king Gezá and his family are baptized as Roman Catholics, beginning a long link between Hungary and Rome
Vladimir, the prince of Kiev, decides that Greek Orthodoxy is the most suitable religion for the Russian people
Iceland's parliament, the althing, passes a resolution that everyone on the island is to be baptized
A Muslim dynasty is established at Gao, on the Niger
The Jews, barred from any work which Christians want to do, find profitable employment as money-lenders
The huge stone heads standing on Easter Island are carved and erected at some time between the sixth and seventeenth century AD
Buddhist, Hindu and Jain shrines are carved from the rock in the cave temples of Ellora, in India
Mahmud of Ghazni marches an army across an Indian desert to destroy a great temple at Somnath, killing - it is said - some 50,000 Hindus
Islam reaches Kanem-Bornu, a joint kingdom encompassing the eastern and western shores of Lake Chad
A Muslim dynasty is established at Kilwa, on the east African coast
Pope Gregory VII decrees that only the church may make ecclesiastical appointments, thus initiating the investiture controversy between pope and emperor
Anselm includes in his Proslogion his famous 'ontological proof' of the existence of God
St Bruno and six companions retire to Chartreuse, in the French Alps, and establish the Carthusian order
Toledo is captured from the Muslims by Alfonso VI of Castile, who continues the city's traditions of religious tolerance

Pope Urban II preaches the first crusade, urging the Christians of Europe to march east to recover Jerusalem from the Muslims
Peter the Hermit, an old monk on a donkey, leads the largest of the popular groups from Germany on the first crusade
The German crusade begins with a massacre of Jews in many of the region's cities
Benedictine monks, wishing to return to the early ideals of the order, form a community at Cîteaux which becomes the Cistercian order
After a siege of seven months, the city of Antioch falls to the knights of the first crusade

Crusaders capture the holy city of Jerusalem and massacre the Muslim and Jewish inhabitants
The Knights of St John of Jerusalem become an established order under papal protection