Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.
Frederick Augustus, Duke of Württemberg-Neuenstadt
Frederick Augustus of Württemberg-Neuenstadt (Neuenstadt am Kocher, 12 March 1654 – 6 August 1716 in Gochsheim) was Duke of Württemberg and second Duke of Württemberg-Neuenstadt.
Sibylla of Anhalt
Sibylla of Anhalt (28 September 1564 – 26 October 1614) was an Ascanian princess of Anhalt who became Duchess of Württemberg by marriage to
Duke Frederick I. She was the fourth (but third surviving) daughter of Joachim Ernest, Prince of Anhalt, by his first wife Agnes, daughter of Wolfgang I, Count of Barby-Mühlingen.
Eberhard III, Duke of Württemberg
Eberhard III, Duke of Württemberg( 16 December 1614 in Stuttgart – 2 July 1674 in Stuttgart) ruled as Duke of Württemberg from 1628 until his death in 1674.
Eberhard III became the heir under guardianship in 1628 during the Thirty Years'
War at the age of 14 after the death of his father, Johann Frederick, 7th Duke of Württemberg.
His guardian at first was his father's brother Louis Frederick, Duke of Württemberg- Montbéliard and after his death in 1631 Julius Frederick, Duke of Württemberg- Weiltingen.
Württemberg lost around one third of its territory in 1629.
Julius Frederick was removed as guardian in 1633 when Eberhard was declared of full age at which point he assumed full rule of the Duchy.
Following a major defeat of Württemberg troops in the battle of Nördlingen on 6 September 1634, Württemberg was severely looted and plundered.
Eberhard fled to Strasbourg where he married in 1637, returning to Württemberg in 1638 after long negotiations with Ferdinand III of the Holy Roman Empire.
By this time many territories had already been passed on by the Emperor to other parties to push forward Catholicism in the region.
The Duchy of Württemberg was reinstated after long negotiations resulting in the Peace of Westphalia of 1648, despite or maybe because of the effects of war, poverty, hunger and the Bubonic plague all of which reduced the population from 350,000 in 1618 to 120,000 in 1648.
Eberhard III entered into an inheritance agreement with his younger brother Frederick thereby handing over ownership of the Duchy of Württemberg- Neuenstadt and thus establishing a new branch line of the duchy.
In 1651, Eberhard came to a similar agreement with another brother, Ulrich affecting the Castle of Neuenbürg.
Prince Frederick of Württemberg
Prince" Frederick" Charles Augustus of Württemberg( 21 February 1808 – 9 May 1870) was a General in the Army of Württemberg and the father of William II of Württemberg.
Frederick was a member of the Royal Family of Württemberg and a Prince of Württemberg.
George II, Duke of Württemberg-Montbéliard
Duke George II of Württemberg- Montbéliard( 5 October 1626 in Montbéliard – 1 June 1699 in Montbéliard) was Duke of Württemberg- Montbéliard from 1662 until his death.
Louis Frederick, Duke of Württemberg-Montbéliard
Louis Frederick of Württemberg-Montbéliard (29 January 1586 in Montbéliard – 26 January 1631 in Montbéliard) was the founder of a cadet line of the House of Württemberg known as the Dukes of Württemberg-Montbéliard.
Louis Frederick of Württemberg was born at Montbéliard Castle as the fifth child and second son of Duke Frederick I of Württemberg, and princess Sibylla of Anhalt.
Frederick II Eugene, Duke of Württemberg
Friedrich Eugen, Duke of Württemberg( 21 January 1732 – 23 December 1797) was the fourth son of Karl Alexander, Duke of Württemberg, and Princess Maria Augusta of Thurn and Taxis( 11 August 1706 – 1 February 1756).
He was born in Stuttgart.
From 1795 until 1797 he was Duke of Württemberg.
Leopold Eberhard, Duke of Württemberg-Montbéliard
Leopold Eberhard of Württemberg- Montbéliard( 21 May 1670, Montbéliard – 25 March 1723, Montbéliard), was a German prince member of the House of Württemberg.
He was Count of Coligny since 1680( in succession of his mother) and Duke of Württemberg- Montbéliard since 1699( in succession of his father) until his death.
The first half of his life he was in exile and in military service of the House of Austria and lived for a long time in Silesia; only in 1697 he and his family were able to return of Montbéliard, and two years later he assumed the government as the last legitimate male member of his dynasty.
He gained a doubtful fame mainly through his arbitrary and absolutist rule as well as by his extravagant family life, which is why he is considered the" Black Sheep" of the House of Württemberg.
Leopold Frederick, Duke of Württemberg-Montbéliard
Leopold Frederick, Duke of Württemberg- Montbéliard( 30 May 1624 in Montbéliard – 15 June 1662 in Montbéliard) was a son of Duke Louis Frederick and his first wife, Elisabeth Magdalena of Hesse- Darmstadt.
He succeeded his father in 1631.
He married Sibylle, the youngest daughter of Duke John Frederick of Württemberg.
The marriage remained childless.
He died in 1662 and was succeeded by his half- brother George II.

Question: Who is the maternal grandfather of Louis Frederick, Duke Of Württemberg-Montbéliard?
Answer: Joachim Ernest, Prince of Anhalt