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.
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.
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.
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.
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.
Maria of Nassau (1491–1547)
Maria, Countess of Nassau, Katzenelnbogen, Vianden and Dietz( 1 February 1491, Vianden- 1547, Siegen) was a noblewoman from the Low Countries.
She was the second and youngest daughter of Johann V of Nassau- Vianden- Dietz and Elisabeth of Hesse- Marburg.
She was the aunt of William the Silent.
In Siegen on 17 February 1506 she married Jobst I, Count of Holstein- Schauenburg, with whom she had 12 children, including:
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.
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 IV of Schaumburg
Otto IV of Schaumburg( 1517 – 21 December 1576) was a German nobleman.
He was a ruling Count of Schauenburg and of Holstein- Pinneberg.
He was a son of Jobst I and his wife Maria of Nassau, a daughter of Count Johann V of Nassau- Vianden- Dietz.
He adopted the teachings of Martin Luther.
However, with respect to his elder brothers Cologne's Archbishop- Electors Adolphus III( reg. 1547– 1556) and Anthony I( reg. 1557- 1558) he refrained from open confrontation.
In 1559 he officially began the Reformation in Schauenburg and Holstein- Pinneberg.
These areas remained Lutheran throughout the Counter- Reformation and into modern times.
Maria of Loon-Heinsberg
Maria of Loon-Heinsberg (1426 – 20 April 1502) was the daughter of John II of Loon, Lord of Jülich, Heinsberg and Löwenberg.
Her mother was the second wife of John II, Countess Margaret of Solms-Braunfels.
Maria died on 20 April 1502 as the last member of the house of Loon-Heinsberg and is buried with her husband in the mausoleum of Engelbert
I of Nassau in the Church of Our Lady at the Market Square in Breda.

Question: Who is Johann V Of Nassau-Vianden-Dietz's maternal grandfather?