List of rulers of Schleswig-Holstein

The following is a list of rulers (usually dukes) who ruled both Schleswig and Holstein, starting from the first Holstein count who received Schleswig, until both territories were annexed by the Kingdom of Prussia in 1866; and afterwards, titular dukes. == The Houses of Schauenburg and Estridsen == In the course of history, the County of Holstein was several times partitioned among the inheriting sons into up to six lines.

Source: Wikipedia — List of rulers of Schleswig-Holstein (CC BY-SA 4.0)