Ansgar preached in Denmark from 826 to 861, but it was not till after the subsidence of the Viking raids that Adaldag, archbishop of Hamburg, could open a new and successful mission, which resulted in the erection of the bishoprics of Schleswig, Ribe and Aarhus (c. 948), though the real conversion of Denmark must be dated from the baptism of King Harold Bluetooth (960).
A railway connects Aalborg with HjOrring, Frederikshavn and Skagen to the north, and with Aarhus and the lines from Germany to the south.
In the west is the port of Kallundborg, with regular communication by steamer with Aarhus in Jutland.
Absalon, with only Sweyn, bishop of Aarhus, and twelve "housecads," thereupon disembarked, passed between a double row of Wendish warriors, 6000 strong, along the narrow path winding among the morasses, to the gates of the fortress, and, proceeding to the temple of the seven-headed god Rtigievit, caused the idol to be hewn down, dragged forth and burnt.
Otto, having profound faith in the power of the church to reconcile conquered peoples to his rule, provided for the benefit of the Danes the bishoprics of Schleswig, Ripen and Aarhus; and among those which he established for the Slays were the important bishoprics of Brandenburg and Havelberg.