Frederick Louis, Count of Nassau-Ottweiler
Frederick Louis of Nassau- Ottweiler( 13 November 1651 – 25 May 1728) was a member of the House of Nassau.
John II, Lord of Polanen
John III, Lord of Polanen( – 3 November 1378 in Breda) was Lord of Polanen, Lord of De Lek and Lord of Breda.
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.
John I, Lord of Polanen
John I, Lord of Polanen( – 26 September 1342) was Lord of Polanen, Lord of De Lek and Lord of Breda.
William of Nassau (1601–1627)
Willem van Nassau, Lord of De Lek( also" Willem van Nassau- LaLecq", or in French" Willem LaLecq"; 18 August 1601 – 18 August 1627) was a Dutch soldier from 1620 until 1627.
He was the illegitimate son of stadholder Maurice of Nassau, Prince of Orange and his mistress Margaretha van Mechelen.
Like their other illegitimate children, he was recognized with the surname Nassau- LaLecq.
He went by the title Rijksgraaf( Count of the Holy Roman Empire) van Nassau- LaLecq" and was also popularly known in French as the" Chevalier de Nassau".
After 1625 he was granted lands and the title Lord of De Lek.
He received his heerlijkheid of De Lek as a bequest from his father to him and his descendants.
His brother Lodewijk van Nassau had the title" Lord of Beverweerd and Odijk".
From his 19th year on, Willem served in the Dutch army fighting Spain in the Dutch Revolt( 1568 – 1648).
Aged only 24 he received the rank of lieutenant- admiral of Holland and West Friesland, replacing stadholder Frederik Hendrik.
He led the Dutch ships that participated in the Cádiz expedition of 1625.
In the summer of 1627 he was present at the Siege of Grol.
On the 18 August, not long before the end of the siege, fighting with the French troops at the front, Willem received a bullet wound which later proved fatal.
Thus he died on his 27th birthday, with Lodewijk inheriting Willem's fiefdom.
On 4 April 1627, 4 months before his death, Willem married Anna van der Noot, lady of Hoogwoud and Aartswoud, in Sluis.
Though he had no children with Anna, he had one illegitimate son by Barbara Augustinus Cocx, Willem Jonker van Nassau( 1620- 1679).
Frederick Nassau de Zuylestein
Frederick of Nassau, Lord of Zuylestein( 1624–1672) was an illegitimate son of Frederick Henry, Prince of Orange, by Margaretha Catharina Bruyns,
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.
Margaretha van Mechelen
Margaretha van Mechelen (c. 1580 in Lier – 17 May 1662 in The Hague) was a noblewoman of the Southern Netherlands and (from c.1600 to c.1610)
the mistress of Maurice of Nassau, Prince of Orange, with whom she had 3 sons:
Though Maurice refused to marry her (probably because she was a Catholic and only from the minor nobility), he did state his intent to do so from his death bed (and to legitimise and marry off their children).
This would threaten his half-brother Frederick Henry's place in the succession and so Frederick Henry summoned Amalia of Solms-Braunfels and married her a few days before Maurice's death.
William of Nassau (1620–1679)
Jonker Willem van Nassau- La Lecq( c. 1620 The Hague – buried 21 June 1679, The Hague) was an illegitimate son of Willem of Nassau, lord of the Lek, and Barbara Cox.
His father was himself the illegitimate son of Prince Maurice.
In 1657 he served as a soldier.
Four years later he was a chamberlain.
Around 1650 he married Geertruijt Hendriks Mulder( c. 1629- 1719).
Louis of Nassau, Lord of De Lek and Beverweerd
Louis of Nassau, Lord of De Lek and Beverweerd (1602 – The Hague, 28 February 1665) was a Dutch soldier.
He was the illegitimate son of Margaretha van Mechelen and Maurice, Prince of Orange, and so a collateral member of the House of Orange-Nassau.
He was a Lord of the heerlijkheid De Lek and .
From his father he inherited the estate of Beverweerd; and when his older brother Willem died in 1627 he inherited his estate as well.

Question: What is the date of death of Louis Of Nassau, Lord Of De Lek And Beverweerd's mother?
Answer: 17 May 1662