House of Schleswig-Holstein-Sonderburg-Augustenburg

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House of
Wappen Herzog zu Schleswig Holstein.jpg
Country Denmark
Parent house House of Oldenburg
Titles Duke of Schleswig-Holstein-Sonderburg-Augustenburg, Duke of Schleswig-Holstein, Crown Prince of Sweden
Founded 1647
Founder Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg
Current head Extinct
Dissolution 27 April 1931

The House of Schleswig-Holstein-Sonderburg-Augustenburg (Danish: Slesvig-Holsten-Sønderborg-Augustenborg) was a branch of the dukes of Schleswig-Holstein-Sonderburg of the House of Oldenburg. The line descended from Alexander, Duke of Schleswig-Holstein-Sonderburg. Like all the secondary lines from the Sonderburg branch, the heads of the House of Schleswig-Holstein-Sonderburg-Augustenburg were first known as Dukes of Schleswig-Holstein and Dukes of Sonderburg. The family took its name from its ancestral home, Augustenborg Palace, in Augustenborg, Denmark.


Duke Ernst Günther I, first Duke of Augustenborg (1609-1689).

The branch originated from Ernest Gunther, a member of the ducal House of Schleswig-Holstein (its branch of Sønderborg) and a cadet of the royal house of Denmark, the third son of Alexander (1573–1627), 2nd Duke of Sonderborg, thus a grandson of duke Hans (1545–1622), the 1st duke, who was a son of King Christian III.

Ernest Gunther had a castle built in the years after 1651, which received the name Augustenborg in honor of his wife, Auguste, herself also from a branch of Dukes of Schleswig-Holstein, daughter of Philip (1584–1663), Duke of Glucksburg. As that castle became the chief seat of their line, the line eventually used the name Augustenborg as its branch name. As they were agnates of the ducal house, the title of Duke belonged to everyone of them (as is the Germanic custom).

The Dukes of Augustenborg were not sovereign rulers — they held their lands in fief to the sovereign Dukes of Schleswig and Holstein - the Kings of Denmark.

Later, a Danish king made the head of that line specifically Duke of Augustenborg. In the late 18th century, since 1764, the branch of Slesvig-Holsten-Sønderborg-Augustenborg was genealogically the next senior immediately after the main line of Danish kings, and had much Danish nobility blood in their veins. King Frederick VI of Denmark, or rather his chief adviser Andreas Peter Bernstorff, made his only sister Louise Auguste of Denmark to marry the then Hereditary Prince of Augustenborg.

In 1764 Sønderborg castle, the seat of that elder Schleswig-Holstein branch, passed upon its extinction into the hands of the Duke of Augustenborg, but against expectations it did not became a residence (they remained at Augustenborg). Instead it was rented out as a warehouse. The penultimate Duke of Augustenborg, also named Ernst Günther, allowed Sønderborg County Museum to move into a part of the castle in 1920. The next year the Danish state bought the castle from the Duke.

In 1810, a younger scion of the family, Prince Christian August, was chosen as the Crown Prince of Sweden, and adopted by king Charles XIII of Sweden. The Augustenborg dynasty on a royal throne was however not to be actualized, as Prince Christian August died just in a couple of months after his arrival in Sweden.

In the early 19th century the Danish royal line started to go extinct. The Duke of Augustenborg was the next male-line heir to the royal house, though not descended in male line from Frederick III of Denmark and Norway. This made the duke a player in the convoluted Schleswig-Holstein Question, as well in the Danish succession. Frederik August of Augustenborg attempted to proclaim himself as Duke Frederick VIII of Schleswig-Holstein in 1864 upon the final extinction of the main branch, Danish kings.

His daughter Augusta Victoria of Schleswig-Holstein became German Empress as consort of Wilhelm II.

The ducal line died out in 1931. In November 1920 its penultimate head had adopted Prince Johann Georg of Schleswig-Holstein-Sonderburg-Glücksburg and his sister Princess Marie Luise, children of Prince Albrecht of Schleswig-Holstein-Sonderburg-Glücksburg.[1] After Augustenborg's extinction in 1931, the senior status went to the line of Dukes of Glucksburg, heads of the second line of Holstein, known in German as Schleswig-Holstein-Sonderburg-Glücksburg and in Danish as Slesvig-Holsten-Sønderborg-Lyksborg.

List of Dukes[edit]

Dukes of Augustenborg
Dukes of Schleswig-Holstein
Frederick proclaimed himself Duke of Schleswig-Holstein in 1863 and was recognized by Prussia as equivalent of mediatized principalities.

Like the previous Oldenburg dynasty all previous monarchs of the Glücksburg dynasty in Denmark also claimed the titles as Dukes of Schleswig and Holstein. The current Danish monarch, Queen Margrethe II abandoned this tradition upon ascending the Danish throne in 1972. The Glücksburg dynasty considered the two territories to be separate entities and it consequently never used the form "Schleswig-Holstein" in titles. The Russian Romanov dynasty used the form "Schleswig-Holstein".


  1. ^ Almanach de Gotha (182nd ed.). Almanach de Gotha. 1998. pp. 135, 136. ISBN 0-9532142-0-6. 

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