Otto died in 912, and his son Henry, a high-spirited youth, who had greatly distinguished himself against the Slavi, ere long quarrelled with the aged bishop Hatto.

This unfortunate civil war was a signal for a fresh irruption of the Slavi and Hungarians.

During this interval of nine years he aimed at bringing the other enemies of the empire, more particularly the Slavi, into subjection, and making preparations for an expedition against Hungary by which her power should receive a fatal blow.

He places the Horiti to the east of the Slavi Dalamanti, who occupied the district north east of Moravia, with the Surpe, that is, Serbi, Servi, on their north, and the Sisle, Slusli, another Slavonic people, on the west.