Holstein-Itzehoe was a county that was formed from Schauenburg and Holstein by the division of Holstein between Gerhard and John in 1261.

Gerhard of Holstein-Itzehoe was the only regent. After his death in 1290 Holstein-Itzehoe was divided up between Gerhard's sons into the three counties of Holstein-Rendsburg, Holstein-Plön and Holstein-Pinneberg (the latter ruled in personal union with the County of Schauenburg, thus sometimes called Holstein and Schauenburg, or Holstein-Schauenburg, however Schauenburg was the name of the ruling dynasty in all the then Holsatian counties).

Rise and fall of the county

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Holstein
Holstein-Kiel
(1261–1390)
Holstein-Itzehoe
(1261–1300)
Holstein-Segeberg
(1273-1308)
Holstein-Plön
(1300–1390)
Holstein-Rendsburg
(1300–1459)
Holstein-Pinneberg
(1300–1640)
Duchy of
Holstein
(from 1474)
Imperial County of Rantzau
(1650–1726)