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In page Duchy of Schleswig:

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The title of duke of Schleswig was inherited in 1460 by the hereditary kings of Norway, who were also regularly elected kings of Denmark simultaneously, and their sons (unlike Denmark, which was not hereditary). This was an anomaly – a king holding a ducal title of which he as king was the fount and liege lord. The title and anomaly survived presumably because it was already co-regally held by the king's sons.[citation needed] Between 1544 and 1713/20, the ducal reign had become a common dominium, with the royal House of Oldenburg and its cadet branch House of Holstein-Gottorp jointly holding the stake. A third branch, the short-lived House of Haderslev, was already extinct in 1580 by the time of John the Elder.