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.
Catherine of Nassau-Dillenburg
Catherine of Nassau- Dillenburg( 29 December 1543 at Dillenburg Castle in Dillenburg – 25 December 1624 in Arnstadt) was a daughter of William I, Count of Nassau- Dillenburg and his second wife, Juliana of Stolberg.
She was a sister of William the Silent.
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.
Anna of Nassau-Dillenburg (1541–1616)
Anna of Nassau- Dillenburg( 21 September 1541 in Dillenburg – 12 February 1616 in Weilburg) was a daughter of Count William" the Rich" of Nassau- Dillenburg and his second wife, Juliana of Stolberg.
She married Count Albert of Nassau- Weilburg on 16 June 1559 and had the following children:
Elisabeth of Nassau-Dillenburg
Countess Elisabeth of Nassau- Dillenburg( born 25 September 1542 in Dillenburg – died: 18 November 1603 in Dillenburg) was a daughter of William I, Count of Nassau- Dillenburg and Juliana of Stolberg and was one of the sisters of William the Silent.
Juliane of Nassau-Dillenburg (1546–1588)
Juliane of Nassau-Dillenburg (10 August 1546 – 31 August 1588) was a younger sister of prince William I of Orange-Nassau.
Juliane was born at Dillenburg, the twelfth child of count William the Rich and Juliana of Stolberg, his second wife.
Prior to her marriage, she had been engaged with Frederick II of Denmark.
On 14 June 1575 she married Albrecht VII of Schwarzburg-Rudolstadt, with whom she had the following children:
Juliane of Nassau-Dillenburg died during the childbirth of her 10th child.
Juliana of Stolberg
Juliana, Countess of Stolberg-Wernigerode (15 February 1506 in Stolberg, Saxony-Anhalt – 18 June 1580) was the mother of William the Silent, the leader of the successful Dutch Revolt against the Spanish in the 16th century.
Juliana was born in Stolberg as the daughter of Bodo VIII, Count of Stolberg-Wernigerode and Anna of Eppstein-Königstein.
She was raised a Roman Catholic but changed her religion twice, first to Lutheranism and later to Calvinism.
She, along with her second husband, was a convinced Protestant and raised their children in the Protestant ways.
After the death of her second husband in 1559 she remained living at Dillenburg castle, now belonging to her second son John, where she died in 1580.
Her entire life, she kept close to her children, especially William.
When William began his rebellion against Philip II of Spain she supported her son morally and financially.
Because of this financial support, William was able to campaign against Spain in the Netherlands.
A fictionalized account of her life is found in Ethel Herr, Dr. Oma: The Healing Wisdom of Countess Juliana Von Stolberg (P&R Publishing, 2006).
Christian, Prince of Nassau-Dillenburg
Christian, Prince of Nassau- Dillenburg( 12 August 1688 at Dillenburg Castle – 28 August 1739 in Straßebersbach, now part of Dietzhölztal) was the last ruler( i.e. Fürst) of Nassau- Dillenburg from the line that had started in 1606 with George, Count of Nassau- Dillenburg.
Magdalena of Nassau-Dillenburg
Magdalena of Nassau- Dillenburg( 15 December 1547 at Dillenburg Castle in Dillenburg – 16 May 1633 in Öhringen) was a daughter of William I, Count of Nassau- Dillenburg and his second wife, Juliana of Stolberg.
Magdalena was a sister of William the Silent.
William I, Count of Nassau-Dillenburg
William I, Count of Nassau- Dillenburg( nicknamed" William the Rich",; 10 April
1487 – 6 October 1559) was a count of Nassau- Dillenburg from the House of Nassau.
His nickname" the Rich" refers to him having many children.
However, he owned a number of counties: Nassau- Dillenburg, Nassau- Siegen, Nassau- Dietz and Vianden.
William was born in Dillenburg as the younger son of Count John V of Nassau- Dillenburg and Landgravine Elisabeth, daughter of Landgrave Henry III of Hesse- Marburg and Anna of Katzenelnbogen.
He was the brother of count Henry III of Nassau- Breda and the father of William I of Orange.
His eldest son William the Silent inherited the principality of Orange in Southern France from his cousin René of Chalon, as well as the vast properties of the House of Nassau- Dillenburg in the Netherlands from his father, which Engelbert I of Nassau had received by marriage in 1403.
The early House of Orange- Nassau descends from William I., the Silent, while the later House of Orange- Nassau( and the Dutch royal family) descends in the male line from his younger brother John, Count of Nassau- Dillenburg, and from the latter's fifth son, Count Ernst Casimir of Nassau- Dietz, however in the female line also from William of Orange.

Question: Who is Juliane Of Nassau-Dillenburg (1546–1588)'s maternal grandfather?