William II, Landgrave of Hesse
William II( 29 April 1469 – 11 July 1509) was Landgrave of Lower Hesse from 1493 and Landgrave of Upper Hesse after the death of his cousin, William III, Landgrave of Upper Hesse in 1500.
William II is also called" William the Middle" to distinguish him from his elder brother" William I the Elder", and his cousin" William III, the Younger".
His parents were Louis II the Frank( 1438 – 1471) and Mechthild, daughter of Count Louis II of Württemberg.
William II became Landgrave of Lower Hesse in 1493, after his brother William I resigned.
On 9 November 1497 William II married Yolande, daughter of Frederick II of Vaudémont.
She died on 21 May 1500 after the marriage produced one child, William( 27 March 1500 – 8 April 1500).
The same year on 20 October, his second marriage was to Anna of Mecklenburg- Schwerin( 14 September 1485 – 12 May 1525), who bore him three children:
In 1500, William II reunited the Landgraviate of Hesse after the death of his cousin William III.
In 1503, Emperor Maximilian I commissioned William with executing the ban on Elector Philip of the Palatinate.
Johann V of Nassau-Vianden-Dietz
Johann V of Nassau- Vianden- Dietz( Breda, 9 November 1455 – Dillenburg, 30 July 1516) was count of Nassau( in Siegen, Dillenburg, Hadamar and Herborn), Vianden and Diez, and Lord of Breda.
He was the paternal grandfather of William the Silent.
He was the son of Jan IV of Nassau and his wife Maria of Loon- Heinsberg.
Johann V was in 1504 and 1505 stadtholder of Guelders and Zutphen.
In 1504, he inherited Breda and Vianden from his brother Engelbrecht II of Nassau.
Johann V married in 1482 to Elisabeth of Hesse- Marburg, a daughter of Henry III, Landgrave of Upper Hesse and his wife Anna of Katzenelnbogen.
They had 6 children: Count Johann
V was buried at Siegen .< br>
His Dutch possessions went to his eldest son Henry, his German possessions to his other son William.
Henry III, Landgrave of Upper Hesse
Henry III, Landgrave of Upper Hesse, called "the Rich" (15 October 1440 – 13 January 1483) was the second son of Louis I of Hesse and his wife Anna of Saxony.
Upon the death of his father Louis I in 1458, Henry received Upper Hesse and his brother Louis II received Lower Hesse.
He succeeded to the title of Landgrave of Hesse-Marburg in 1458.
His nickname "the Rich" is indicative of his fortune in territory and tolls on the Rhine received by his marriage to Anna, daughter and heir of Philipp, the last Count of Katzenelnbogen and his wife Anne of Württemberg.
Louis I, Landgrave of Hesse
Louis I of Hesse  (6 February 1402, Spangenberg - 17 January 1458), called "the Peaceful" was Landgrave of Lower Hesse (Hesse) from 1413-1458.
He was the son of Hermann II, Landgrave of Hesse and Margaret, the daughter of Frederick V of Nuremberg.
He married Anna (5 June 1420 - 17 September 1462) daughter of Frederick I, Elector of Saxony on 13 September 1436.
Their children were:
After 1425 a conflict with the Electorate of Mainz over claims to power in Hesse broke out into open conflict and Archbishop Conrad III of Mainz suffered a decisive defeat at Fulda in 1427.
John II, Duke of Cleves
John II," The Babymaker", Duke of Cleves, Count of Mark,( German: Johann II." der Kindermacher", Herzog von Kleve, Graf von Mark)( 13 April 1458 – 15 March 1521) was a son of John I, Duke of Cleves and Elizabeth of Nevers.
He ruled Cleves from 1481 to his death in 1521.
He was called" The Babymaker" since he fathered sixty- three illegitimate children before his marriage with Mathilde of Hesse in 1490.
She was the daughter of Henry III, Landgrave of Upper Hesse and his wife Anna of Katzenelnbogen.
They had three children:
Matilda of Hesse
Mathilde of Hesse( 4 July 1473 in Blankenstein – 19 February 1505 in Cologne) was the daughter of Henry III, Landgrave of Upper Hesse( 1441- 1483) and his wife Anna of Katzenelnbogen( 1443- 1494).
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Louis III, Landgrave of Thuringia
Louis III, Landgrave of Thuringia, nicknamed" Louis the Pious" or" Louis the Mild"( 1151/52 – 16 October 1190, in the eastern Mediterranean Sea, near Cyprus) was a German nobleman.
He was a member of the Ludowingians dynasty and was the ruling Landgrave of Thuringia from 1172 until his death.
Henry Percy, 1st Earl of Northumberland
Henry Percy, 1st Earl of Northumberland, 4th Baron Percy, titular King of Mann, KG, Lord Marshal( 10 November 134120 February 1408) was the son of Henry de Percy, 3rd Baron Percy, and a descendant of Henry III of England.
His mother was Mary of Lancaster, daughter of Henry, 3rd Earl of Lancaster, son of Edmund, Earl of Leicester and Lancaster, who was the son of Henry III.
Countess Elisabeth of Leuchtenberg
Elisabeth of Leuchtenberg( born: March 1537- died: 6 July 1579 in Dillenburg) was the daughter of Landgrave George III, Landgrave of Leuchtenberg and Margravine Barbara of Brandenburg- Ansbach.

Question: Who is the paternal grandfather of Henry Iii, Landgrave Of Upper Hesse?
Answer: Hermann II, Landgrave of Hesse