information:classification
Livonian Crusade

By the 12th century, the peoples inhabiting the lands now known as Estonia, Latvia and Lithuania formed a pagan wedge between increasingly powerful rival Christian states – the Orthodox Church to their east and the Catholic Church to their west. The difference in creeds was one of the reasons they were able to resist being forcibly converted to a different religion. During a period of more than 150 years leading up to the arrival of German crusaders in the region, Estonia was attacked thirteen times by Russian principalities, and by Denmark and Sweden as well. Estonians for their part made raids upon Denmark and Sweden. There were peaceful attempts by some Catholics to convert the Estonians, starting with missions dispatched by Adalbert, Archbishop of Bremen in 1045–1072. However, these peaceful efforts seem to have had limited success.