Partitioned-off duke
In the duchies of Schleswig and Holstein, the term partitioned-off duke (German: Abgeteilte Herren) was used to denote a series of dukes whose territories were not recognized by the estates of the realm. == Background == The background for this phenomenon was the Treaty of Ribe of 1460, in which King Christian I of Denmark, after his election as Duke of Schleswig and Count of Holstein, had laid down that Schleswig and Holstein should forever be ruled by a joint sovereign, in a personal union with Denmark.