It is one of the mightiest rivers of the .continent.
Mission work commenced in Bulgaria during the latter part of the 9th century; thence it extended to Moravia, where in 863 two Greek missionaries - Cyril and Methodius - provided for the people a Slavonic Bible and a Slavonic Liturgy; thence to Bohemia and Poland, and so onwards to the Russian kingdom of Ruric the Northman, where about the close of the 10th century the Eastern Church " silently and almost unconsciously bore into the world her mightiest offspring."
It was the resurrection of the mightiest spirits of the past.
At his death in 1025 he left Poland one of the mightiest states of Europe, extending from the Bug to the Elbe, and from the Baltic to the Danube, and possessing besides the overlordship of Russia.
He encased himself in fatalism, with the result that in two years the mightiest empire reared by man broke under the twofold strain.