The Duchy of Oldenburg (German: Herzogtum Oldenburg) — named after its capital, the town of Oldenburg — was a state in the north-west of present-day Germany. Oldenburg survived from 1180 until 1810 when it was annexed by First French Empire. It was located near the mouth of the River Weser. When the main lineage of the House of Oldenburg Anthony Günther, Count of Oldenburg died out in 1667, it fell to the Danish Royal Family. Charles Frederick of the line of the Dukes of Holstein-Gottorp married Grand Duchess Anna Petrovna of Russia daughter of Peter the Great. Another, his first cousin, Frederick August I became Duke of Oldenburg in 1774. One of his brothers, Adolf Frederick became King of Sweden. Another brother, Prince Georg Ludwig of Holstein-Gottorp, was father of Peter I which became Grand Duke of Oldenburg in 1823. Subsequent Rulers of Oldenburg were all his descendants. Its ruling family, the House of Oldenburg, also came to rule in Denmark, Norway, Sweden, Greece and Russia, and the heirs of a junior line of the Greek branch are, through Prince Philip, Duke of Edinburgh, likely to inherit the thrones of the United Kingdom and the Commonwealth realms after the death or abdication of Queen Elizabeth II.
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