Frederick William, Prince of Nassau-Weilburg
Frederick William, Prince of Nassau- Weilburg( 25 October 1768, The Hague – 9 January 1816, Weilburg) was a ruler of Nassau- Weilburg.
In 1806 he was given the title of Prince of Nassau, while his cousin, Prince Frederick Augustus of Nassau- Usingen, became the Duke of Nassau.
Frederick William died in January 1816, only two months before his cousin.
Both men were succeeded by Frederick William's son, William.
Adolf of Nassau (1540–1568)
Adolf of Nassau (Dillenburg, 11 July 1540 – Heiligerlee, 23 May 1568) was a count of Nassau, also known as Adolphus of Nassau.
He was the fourth son and sixth child of William I, Count of Nassau-Dillenburg and Juliana of Stolberg.
He was the second youngest brother of William the Silent.
Walram II, Count of Nassau
Walram II of Nassau,( – 24 January 1276), was Count of Nassau and is the ancestor of the Walramian branch of the House of Nassau.
Philip of Nassau
Philip of Nassau or Filips of Nassau (1 December 1566, Dillenburg – 3 September 1595, Rheinberg) was a Count of Nassau, Katzenelnbogen, Vianden and Dietz, fought for the United Provinces during the Eighty Years' War.
He was the son of John VI and Countess Elisabeth of Leuchtenberg.
Philip studied with his brother William Louis and his cousin Maurice in Heidelberg, and later with his cousin Maurice in Leiden.
He then spent some time in the retinue of his uncle William the Silent, who called him "FlipchenFlippy").
Later, he enlisted in the Dutch States Army and in 1585 he became Colonel of the infantry.
From 1586 to 1587, Philip was governor of Gorinchem, then in 1591, after the Siege of Nijmegen, he was governor of Nijmegen.
From Nijmegen Philip started a campaign in Luxembourg, where he engaged the Spanish enemy.
In 1594, he participated in the Reduction of Groningen.
Then, on 2 September 1595, he commanded more than 500 cavalry, in the battle on the Lippe, along with his brothers Louis Gunther and Ernst Casimir.
During the battle, Philip got seriously injured.
The next day he died.
He was buried on 22 October 1595 in the St Eusebius' Church in Arnhem.
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.
Henry I, Count of Nassau-Siegen
Henry I of Nassau- Siegen,( – between 13 July and 14 August 1343) was Count of Nassau- Siegen, a part of the County of Nassau, and ancestor of the House of Nassau- Siegen.
He comes from the Ottonian branch of the House of Nassau.
Frederick Augustus, Duke of Nassau
Friedrich August, Duke of Nassau, Prince of Nassau- Usingen( 23 April 1738 in Usingen – 24 March 1816 in Wiesbaden) was the last Prince of Nassau- Usingen and, jointly with his cousin, Friedrich Wilhelm of Nassau- Weilburg, first Duke of Nassau.
He died without surviving male issue and was succeeded by his cousin's son, Wilhelm.
Otto I, Count of Nassau
Otto I of Nassau,( † between 3 May 1289 and 19 March 1290) was Count of Nassau and is the ancestor of the Ottonian branch of the House of Nassau.
Otto II of Nassau
Otto II of Nassau( – 1351) was a German nobleman.
He was a Count of Nassau- Dillenburg in Siegen and Dillenburg, and was a son of Count Heinrich of Nassau and Adelheid of Heinsberg.
Otto married Adelheid of Vianden, daughter of Philip of Vianden and Adelheid of Arnsberg.
They had four children:
Elisabeth of Nassau-Dillenburg, Countess of Wied
Elisabeth of Nassau-Dillenburg (1 December 1488 – 3 June 1559 in Dillenburg) was a member of the House of Nassau.
She was a daughter of John V of Nassau-Dillenburg and his wife Elisabeth of Hesse-Marburg.
Her brothers were Henry III of Nassau-Breda, John of Nassau-Vianden-Dietz, Ernest of Nassau and William the Rich.
Her sister was Maria of Nassau.

Question: Who is Philip Of Nassau's maternal grandfather?