Christian August, Duke of Schleswig-Holstein-Sonderburg-Augustenburg
Christian August I, Duke of Schleswig- Holstein- Sonderburg- Augustenburg
( 4 August 1696 – 20 January 1754) was a son of Frederick William of Schleswig- Holstein- Sonderburg- Augustenburg, who was himself a son of Ernest Günther.
He served as provost of the cathedral chapter in Hamburg.
Later, he became governor of the Danish island Als, then General of the Infantry and Colonel of the royal guards in Denmark.
In 1731, Christian August I succeeded his childless uncle Ernest August.
Joachim Ernest, Duke of Schleswig-Holstein-Sonderburg-Plön
Joachim Ernest of Schleswig-Holstein- Sonderburg- Plön( 29 August 1595 – October 5, 1671), also" Joachim Ernest of Schleswig- Holstein- Plön", was the first Duke of Schleswig- Holstein- Sonderburg- Plön, which emerged from a division of the Duchy of Schleswig- Holstein- Sonderburg.
Princess Alexandra Victoria of Schleswig-Holstein-Sonderburg-Glücksburg
Princess Alexandra Victoria of Schleswig-Holstein- Sonderburg- Glücksburg( 21 April 1887 – 15 April 1957) was a daughter of Friedrich Ferdinand, Duke of Schleswig- Holstein and his wife Princess Karoline Mathilde of Schleswig- Holstein- Sonderburg- Augustenburg.
Ernest Günther, Duke of Schleswig-Holstein-Sonderburg-Augustenburg
Ernest Günther of Schleswig-Holstein-Sonderburg-Augustenburg (14 October 1609 – 18 January 1689) was a Duke of Schleswig-Holstein of its Sonderborg line.
He was the first to have his ducal seat in Augustenborg Palace, which he built and named in honor of his wife.
He ruled from 1647 until his death in 1689.
He was third son of Alexander, Duke of Schleswig-Holstein-Sonderburg and his wife Countess Dorothea of Schwarzburg-Sondershausen.
Prince Frederick of Schleswig-Holstein-Sonderburg-Augustenburg
Prince Frederick Emil August of Schleswig-Holstein- Sonderburg- Augustenburg( Kiel, 23 August 1800 – Bayreuth, Germany, 2 July 1865), usually simply known by just his first name, Frederick," Prince of Noer", was a prince of the House of Schleswig- Holstein- Sonderburg- Augustenburg and a cadet- line descendant of the Danish royal house.
He was the second and youngest son of Louise Auguste of Denmark and Frederik Christian II, Duke of Schleswig- Holstein- Sonderburg- Augustenburg.
As such, he was close to succeed in the Danish throne.
He was the brother- in- law of King Christian VIII and nephew of King Frederik VI.
His elder brother, Christian August II, succeeded in 1814 as the Duke of Schleswig- Holstein- Sonderburg- Augustenburg.
After his second, morganatic union, he renounced the rights of succession to House of Augustenburg.
He was created Prince of Noer or Nør by Emperor Franz Joseph of Austria afterwards.
Prince Frederick died 1865 at Bayreuth.
Friedrich, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
Friedrich of Schleswig- Holstein- Sonderburg- Glücksburg( 23 October 1814 in Schleswig, Duchy of Schleswig – 27 November 1885 in Luisenlund, Schleswig- Holstein, Prussia) was the third Duke of Schleswig- Holstein- Sonderburg- Glücksburg.
Friedrich was the second- eldest son of Friedrich Wilhelm, Duke of Schleswig- Holstein- Sonderburg- Glücksburg and Princess Louise Caroline of Hesse- Kassel and an elder brother of Christian IX of Denmark.
Friedrich inherited the title of Duke of Schleswig- Holstein- Sonderburg- Glücksburg upon his childless brother Karl's death on 14 October 1878.
Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg (4 January 1785 – 17 February 1831) inherited the title of Duke of Schleswig-Holstein-Sonderburg-Beck in 1816.
He subsequently changed his title to Duke of Schleswig-Holstein-Sonderburg-Glücksburg in 1825 and founded a line that includes the Royal Houses of Denmark, Greece, Norway, and the Commonwealth realms.
Karl, Duke of Schleswig-Holstein-Sonderburg-Glücksburg
Karl of Schleswig -Holstein- Sonderburg- Glücksburg( 30 September 1813 at Gottorp in Schleswig, Duchy of Schleswig – 24 October 1878 at Luisenlund, Glücksburg, in Schleswig- Holstein, Prussia) was the second Duke of Schleswig- Holstein- Sonderburg- Glücksburg.
Karl was the eldest son of Friedrich Wilhelm, Duke of Schleswig- Holstein- Sonderburg- Glücksburg and Princess Louise Caroline of Hesse- Kassel and an elder brother of Christian IX of Denmark.
Karl became Duke of Schleswig- Holstein- Sonderburg- Glücksburg upon his father's death on 27 February 1831.
Alexander, Duke of Schleswig-Holstein-Sonderburg
Alexander, Duke of Schleswig-Holstein-Sonderburg (20 January 1573 – 13 May 1627), was a Danish nobleman.
Alexander was born in Sønderborg (German: "Sonderburg") in Schleswig, the third son of John II, Duke of Schleswig-Holstein-Sonderburg and Elisabeth of Brunswick-Grubenhagen.
Because his elder surviving brother chose Ærø as his seat, Alexander received Sønderborg upon their father's death and was in practice its second duke.
Alexander died in Sønderborg.
Alexander married Dorothea of Schwarzburg-Sondershausen, daughter of
John Günther I, Count of Schwarzburg-Sondershausen, on 26 November 1604 in Oldenburg.
They had eleven children:
Friedrich Ferdinand, Duke of Schleswig-Holstein
Friedrich Ferdinand of Schleswig- Holstein- Sonderburg- Glücksburg( 12 October 1855 – 21 January 1934) was the fourth Duke of Schleswig- Holstein- Sonderburg- Glücksburg and became Duke of Schleswig- Holstein in 1931.

Question: Who is the paternal grandmother of Ernest Günther, Duke Of Schleswig-Holstein-Sonderburg-Augustenburg?