House of Schleswig-Holstein-Sonderburg-Augustenburg
noble family
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 of 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.
History
The branch originated from Ernest Günther, a member of the ducal house of Schleswig-Holstein (its branch of Sønderborg) and a cadet of the royal house of Denmark. He was the third son of Alexander, 2nd Duke of Sonderborg (1573–1627), and thus a grandson of John the Younger (1545–1622), the first duke, who was a son of King Christian III of Denmark.
Ernest Günther had a castle built in the years after 1651, which received the name of Augustenburg in honor of his wife, Auguste. She was also from a branch of the Dukes of Schleswig-Holstein as a daughter of Philip (1584–1663), Duke of Glücksburg. As that castle became the chief seat of their line, the family eventually used the name of Augustenborg as its branch name. As they were agnates of the ducal house, the title of duke belonged to every one of them (as is the Germanic custom).
“House of Schleswig-Holstein-Sonderburg-Augustenburg” enters the record as noble family. Crown Archives preserves that source wording while asking what House, Schleswig-Holstein-Sonderburg-Augustenburg and noble can confirm, complicate or overturn.
Why this record matters
“House of Schleswig-Holstein-Sonderburg-Augustenburg” is worth following because a concise public description often conceals a longer documentary argument. Here, House, Schleswig-Holstein-Sonderburg-Augustenburg and noble provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Aug 12, 2026. The linked authority identifier is Q690037. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1573, 1627, 1545 and 1622.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “House of Schleswig-Holstein-Sonderburg-Augustenburg”, its source revision and the description used here.
- Expand the search: follow House of Schleswig-Holstein-Sonderburg-Augustenburg primary sources, House of Schleswig-Holstein-Sonderburg-Augustenburg archive and House research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “House of Schleswig-Holstein-Sonderburg-Augustenburg”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “House of Schleswig-Holstein-Sonderburg-Augustenburg” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.