Georg, Prince of Schaumburg-Lippe
Georg, Prince of Schaumburg- Lippe( 10 October 1846 – 29 April 1911) was a ruler of the small Principality of Schaumburg- Lippe.
Ernst of Schaumburg
Ernst of Schaumburg (September 24, 1569 – January 17, 1622) was the first Count of Schauenburg and Holstein-Pinneberg to earn the title of Prince in 1619.
However, he died in 1622 without an heir.
Schauenburg-Pinneberg had been a Lutheran region since his grandfather Otto IV of Schaumburg had been won over to Martin Luther's teachings.
After Ernst's death, a Catholic Count, Jobst Hermann, received a portion of Schauenburg but he also died without children, and Otto V, who was a Calvinist, succeeded Ernst.
Prince Ernst built the Stadthagen Mausoleum for himself and his family.
Today, this building is estimated as a cultural monument of European rank.
On 11 September 1597 he married Hedwig of Hesse-Kassel at Wilhelmsburg Castle in Schmalkalden.
The marriage remained childless.
Heinrich Donatus, Hereditary Prince of Schaumburg-Lippe
Heinrich Donatus, Hereditary Prince of Schaumburg- Lippe( Ernst- August Alexander Wilhelm Bernhard Krafft Heinrich Donatus; born 13 May 1994) is the son of Alexander, Prince of Schaumburg- Lippe and thus heir to the German Princely house of Schaumburg- Lippe.
Prince Heinrich Donatus of Schaumburg- Lippe was born in Hanover to Alexander, Hereditary Prince of Schaumburg- Lippe( born 1958), and Princess Marie- Louise(" Lilly") of Sayn- Wittgenstein- Berleburg( born 1972), who had married in August 1993.
His mother suffered a nervous breakdown in 1998, and left her husband in 2000 to move with her son from Hanover to Munich.
The couple divorced in 2002.
On the death of his father, Philip- Ernst, Prince of Schaumburg- Lippe, Alexander inherited the title Prince of Schaumburg- Lippe, while his son became Hereditary Prince.
In 2007, the Prince of Schaumburg- Lippe married lawyer Nadja Anna Zsoeks.
Princess Marie- Louise is now married to designer Lambros Milona, with whom she has a daughter, Lana.
Prince Frederick of Schaumburg-Lippe
Prince Frederick of Schaumburg- Lippe( 30 January 186812 December 1945) was a German prince and head of the Náchod branch of the princely house of Schaumburg- Lippe.
He was a son of Prince William of Schaumburg- Lippe, by his wife Princess Bathildis of Anhalt- Dessau.
Adolf II, Prince of Schaumburg-Lippe
Adolf II, Prince of Schaumburg- Lippe( 23 February 1883 – 26 March 1936) was the last ruler of the small Principality of Schaumburg- Lippe.
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.
Wolrad, Prince of Schaumburg-Lippe
Ernst Wolrad, Prince of Schaumburg- Lippe( 19 April 1887 – 15 June 1962) was a head of the Princely House of Schaumburg- Lippe.
Adolf I, Prince of Schaumburg-Lippe
Adolf I, Prince of Schaumburg-Lippe (1 August 1817 – 8 May 1893) was a ruler of the Principality of Schaumburg-Lippe.
Frederick Christian, Count of Schaumburg-Lippe
Friedrich Christian, Count of Schaumburg- Lippe( 16 August 1655 – 13 June 1728) was the second ruler of the County of Schaumburg- Lippe.
Landgravine Juliane of Hesse-Philippsthal
Juliane of Hesse- Philippsthal( 8 June 1761 – 9 November 1799), was a countess of Schaumburg- Lippe, married in 1780 to Count Philip II, Count of Schaumburg- Lippe.
She served as the regent of Schaumburg- Lippe during the minority of her son from 1787 to 1799.

Question: What is the date of death of Ernst Of Schaumburg's father?
Answer: 21 December 1576