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.
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.
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.
Henry III of Nassau-Breda
Count Henry III of Nassau- Dillenburg- Dietz( 12 January 1483, Siegen – 14 September 1538, Breda), Lord( from 1530 Baron) of Breda, Lord of the Lek, of Dietz, etc. was a count of the House of Nassau.
He was the son of Count John V of Nassau- Dillenburg and Elisabeth of Hesse- Marburg.
His younger brother was William I, Count of Nassau- Dillenburg( the father 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.
William II, Prince of Nassau-Dillenburg
William II, Prince of Nassau- Dillenburg( 28 August 1670 – 21 September 1724 in Dillenburg) was the ruler( i.e. Fürst) of Nassau- Dillenburg from 1701 until his death.
His parents were Henry, Prince of Nassau- Dillenburg( 1641 – 1701) and his wife Princess Dorothea Elisabeth of Legnica- Brzeg( 1646 – 1691).
Maria of Nassau-Dillenburg
Maria of Nassau- Dillenburg( 1568- 1625) was a daughter of Count John VI" the Elder" of Nassau- Dillenburg and his first wife, Countess Elisabeth of Leuchtenberg.
Maria married
John Louis I, Count of Nassau- Wiesbaden- Idstein in 1588 and was the mother of:
Albert, Count of Nassau-Dillenburg
Albert, Count of Nassau-Dillenburg (1 November 1596 in Dillenburg – 16 June 1626 in Quakenbrück) was a son of Count George of Nassau-Dillenburg and his first wife, Anna Amalia of Nassau-Saarbruucken.
After his father died in 1623, he ruled Nassau-Dillenburg jointly with his elder brother Louis Henry until Albert died himself in 1626.
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.
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).

Question: Who is the maternal grandmother of Catherine Of Nassau-Dillenburg?