Princess Amalia of Nassau-Dietz
Princess Amalia of Nassau- Dietz( Anna Charlotte Amalie; – 18 September 1777) was the wife of Frederick, Hereditary Prince of Baden- Durlach, and mother of Charles Frederick, the first Grand Duke of Baden.
Frederick, Hereditary Prince of Baden-Durlach
Frederick, Hereditary Prince of Baden-Durlach (7 October 1703 – 26 March 1732) was a German hereditary prince of the Margraviate of Baden-Durlach.
Frederick was the son of Charles III William, Margrave of Baden-Durlach, and Magdalena Wilhelmine of Württemberg (7 November 1677 - 30 October 1742), the daughter of William Louis, Duke of Württemberg.
He became heir apparent when his elder brother Charles Magnus died in 1712.
However, he died before his father did and therefore never came to government in Durlach.
He served in the imperial army.
In 1724, he was appointed colonel, in 1728, he was promoted to major general.
Princess Juliane Sophie of Denmark
Juliane Sophie( 18 February 1788, in Copenhagen – 9 May 1850, in Copenhagen) was a Princess of Denmark, the daughter of Frederick, Hereditary Prince of Denmark, who himself was a younger son of King Frederick V of Denmark in his second marriage to queen Juliana Maria of Braunschweig- Wolfenbüttel.
Frederick, Hereditary Prince of Denmark
Frederick, Hereditary Prince of Denmark( 11 October 1753 – 7 December 1805) was heir presumptive to the thrones of Denmark and Norway.
He was the only surviving son of King Frederick V by his second wife, Juliana Maria of Braunschweig- Wolfenbüttel.
Hereditary Prince Frederick acted as regent on behalf of his half- brother King Christian VII from 1772 to 1784.
Prince George Bernhard of Anhalt-Dessau
George Bernhard of Anhalt- Dessau( 21 February 1796 – 16 October 1865), was a German prince of the House of Ascania from the Anhalt- Dessau branch.
He was born in Dessau, the second son of Frederick, Hereditary Prince of Anhalt- Dessau, by his wife Landgravine Amalie of Hesse- Homburg, daughter of Frederick V, Landgrave of Hesse- Homburg.
Frederick V of the Palatinate
Frederick V (26 August 1596 – 29 November 1632) was the Elector Palatine of the Rhine in the Holy Roman Empire from 1610 to 1623, and reigned as King of Bohemia from 1619 to 1620.
He was forced to abdicate both roles, and the brevity of his reign in Bohemia earned him the derisive sobriquet "the Winter King"
(Czech: "Zimní král";
German: "Winterkönig").
Frederick was born at the  (a hunting lodge) near Amberg in the Upper Palatinate.
He was the son of Frederick IV and of Louise Juliana of Orange-Nassau, the daughter of William the Silent and Charlotte de Bourbon-Montpensier.
An intellectual, a mystic, and a Calvinist, he succeeded his father as Prince-Elector of the Rhenish Palatinate in 1610.
He was responsible for the construction of the famous "Hortus Palatinus" gardens in Heidelberg.
In 1618 the largely Protestant estates of Bohemia rebelled against their Catholic King Ferdinand, triggering the outbreak of the Thirty Years' War.
Frederick was asked to assume the crown of Bohemia.
He accepted the offer and was crowned on 4 November 1619, as Frederick I (the adjective means "of Oberpfalz" or "of the Upper Palatinate").
The estates chose Frederick since he was the leader of the Protestant Union, a military alliance founded by his father, and hoped for the support of Frederick's father-in-law, James VI of Scotland and I of England.
However, James opposed the takeover of Bohemia from the Habsburgs and Frederick's allies in the Protestant Union failed to support him militarily by signing the Treaty of Ulm (1620).
His brief reign as King of Bohemia ended with his defeat at the Battle of White Mountain on 8 November 1620 – a year and four days after his coronation.
After the battle, the Imperial forces invaded Frederick's Palatine lands and he had to flee to his uncle Prince Maurice, Stadtholder of the Dutch Republic in 1622.
An Imperial edict formally deprived him of the Palatinate in 1623.
He lived the rest of his life in exile with his wife and family, mostly at The Hague, and died in Mainz in 1632.
His eldest surviving son Charles I Louis, Elector Palatine, returned to power in 1648 with the end of the war.
Another son was Prince Rupert of the Rhine, one of the most colourful figures of his time.
His daughter Princess Sophia was eventually named heiress presumptive to the British throne, and is the founder of the Hanoverian line of kings.
Henry Frederick, Hereditary Prince of the Palatinate
Henry Frederick, Electoral Prince of the Palatinate, (1 January 1614 – 7 January 1629 in the Netherlands) was the eldest son of Frederick V, the Winter King, and his wife, Elizabeth Stuart, daughter of King James I of England.
As soon as the prince was born, Elizabeth ordered "pieces" using the English word, meaning the firing of cannon to celebrate the birth.
He was most probably named after his dead uncle Henry Frederick, Prince of Wales, who like him died a teenager.
He wrote a letter to his grandfather King James from The Hague on 11 May 1621.
Henry Frederick drowned at the age of 15.
He was on his way to Amsterdam to see the captured Spanish treasure fleet there and drowned crossing the Haarlemmermeer.
David Murray (poet)
Sir David Murray of Gorthy( 1567 – 1629) was an officer in the household of Henry Frederick, Prince of Wales, in England from 1603 to 1612, and poet.
Carol Victor, Hereditary Prince of Albania
Carol Victor, Hereditary Prince of Albania( Karl Viktor Wilhelm Friedrich Ernst Günther von Wied, 19 May 19138 December 1973) was the only son of William, Prince of Albania and briefly heir to the Principality of Albania.
He held the title of" Hereditary Prince of Albania".
He was also styled Skënder, in homage to Skanderbeg, the national hero.
Frederick, Hereditary Prince of Saxony
Frederick, Hereditary Prince of Saxony( 15 March 1504, Dresden- 26 February 1539, Dresden) was a German nobleman and member of the Albertine branch of the house of Wettin.

Question: Who is Henry Frederick, Hereditary Prince Of The Palatinate's paternal grandfather?
Answer: Frederick IV