Editing Holstein (section)

===Partitions of the County of Holstein (1111–1474)===
The [[Counts of Schauenburg and Holstein]] partitioned Holstein several times among the inheriting sons into up to six lines, named after their towns of residence: 
* [[Holstein-Itzehoe]], branch county between 1261 and 1290, partitioned from Holstein, repartitioned into Holstein-Pinneberg, Holstein-Plön and Holstein-Rendsburg
* [[Holstein-Kiel]], branch county between 1261 and 1390, partitioned from Holstein, in 1273 Holstein-Segeberg (first) was partitioned from Holstein-Kiel, but reverted in 1308, but then lost to Holstein-Pinneberg, Holstein-Plön and Holstein-Rendsburg in 1316; Holstein-Kiel acquired Holstein-Plön in 1350, and merged itself into Holstein-Rendsburg
* [[Holstein-Pinneberg]], branch county between 1290 and 1640, partitioned from Holstein-Itzehoe, acquired a share of Holstein-Segeberg in 1316, merged into the Duchy of Holstein
* [[Holstein-Plön]], branch county between 1290 and 1390, partitioned from Holstein-Itzehoe, acquired a share of Holstein-Segeberg in 1316, merged into Holstein-Kiel
* [[Holstein-Rendsburg]], branch county between 1290 and 1474, partitioned from Holstein-Itzehoe, acquired a share of Holstein-Segeberg (first) in 1316, and Holstein-Kiel in 1390, in 1381/1384 Holstein-Segeberg (second) was partitioned from Holstein-Rendsburg, but reverted in 1403, elevated to ducal rank in 1474
* Holstein-[[Bad Segeberg|Segeberg]] (first), branch county between 1273 and 1308, partitioned from and reverted to Holstein-Kiel, but seized by allied Holstein-Pinneberg, Holstein-Plön, and Holstein-Rendsburg, partitioning Segeberg in three shares, each merged into one of the lines in 1316
* Holstein-Segeberg (second), branch county between 1381/1384 and 1403, partitioned from and reverted to Holstein-Rendsburg

In 1386 King [[Olav IV of Norway|Oluf II of Denmark]] and his mother, Queen [[Margaret I of Denmark|Margaret I]], [[enfeoffed]] in [[Nyborg]] [[Gerhard VI, Count of Holstein-Rendsburg]] and his cognatic successors with the Duchy of Schleswig.<ref>Esben Albrectsen, "Das Abel-Geschlecht und die Schauenburger als Herzöge von Schleswig", Marion Hartwig and Frauke Witte (trls.), in: ''Die Fürsten des Landes: Herzöge und Grafen von Schleswig, Holstein und Lauenburg'' [De slevigske hertuger; German], Carsten Porskrog Rasmussen (ed.) on behalf of the Gesellschaft für Schleswig-Holsteinische Geschichte, Neumünster: Wachholtz, 2008, pp. 52-71, here pp. 63seq. {{ISBN|978-3-529-02606-5}}</ref> He thus became as Gerhard II duke of Schleswig. Until 1390 the Rendsburg branch united by inheritance all branches except of that of Holstein-Pinneberg.

When the Holstein-Rendsburg line of the Schauenburg counts became extinct with the death of [[Adolf VIII, Count of Holstein|Adolf VIII of Holstein-Rendsburg]] (and in [[personal union]] as Adolf I Duke of Schleswig) in 1459, [[Christian I of Denmark]] inherited – from his maternal uncle Adolf I – the Duchy of Schleswig, a Danish fief. Through the [[Treaty of Ribe]] (1460) Christian was elected Count of Holstein-Rendsburg, then still a [[Saxe-Lauenburg]]ian subfief within the Holy Roman Empire.