Andreas, Prince of Saxe-Coburg and Gotha
Andreas, Prince of Saxe- Coburg and Gotha, Duke of Saxony( given names:" Andreas Michael Friedrich Hans Armin Siegfried Hubertus"; born 21 March 1943) has been the head of the House of Saxe- Coburg and Gotha since 1998.
He is the grandson of Charles Edward, the last ruling duke of Saxe- Coburg and Gotha.
Princess Sophie of Saxe-Coburg-Saalfeld
Princess Sophie Friederike Karoline Luise of Saxe- Coburg- Saalfeld( 19 August 1778 – 9 July 1835) was a princess of Saxe- Coburg- Saalfeld, and the sister of Princess Victoria of Saxe- Coburg- Saalfeld and King Leopold I of Belgium, and aunt of Queen Victoria.
By marriage, she was a Countess of Mensdorff- Pouilly.
She was born in Coburg, the eldest child of Francis, Duke of Saxe- Coburg- Saalfeld and Countess Augusta Reuss of Ebersdorf.
Ernest Frederick, Duke of Saxe-Coburg-Saalfeld
Ernest Frederick, Duke of Saxe- Coburg- Saalfeld( 8 March 1724 in Saalfeld – 8 September 1800 in Coburg), was a Duke of Saxe- Coburg- Saalfeld.
John, Elector of Saxony
Johann (30 June 1468 – 16 August 1532), known as Johann the Steadfast or Johann the Constant ("Johann, der Beständige"), was Elector of Saxony from 1525 until 1532 from the House of Wettin.
He is notable for organising the Lutheran Church in the Electorate of Saxony from a state and administrative level.
In that, he was aided by Martin Luther, whose "Saxon model" of a Lutheran church was also soon to be implemented beyond Saxony, in other territories of the Holy Roman Empire.
Luther turned to the Elector for secular leadership and funds on behalf of a church largely shorn of its assets and income after the break with Rome.
He took a part in the Protestation at Speyer.
Alfred, Duke of Saxe-Coburg and Gotha
Alfred( Alfred Ernest Albert; 6 August 184430 July 1900) reigned as Duke of Saxe- Coburg and Gotha from 1893 to 1900.
He was the second son and fourth child of Queen Victoria of the United Kingdom and Prince Albert of Saxe- Coburg and Gotha.
He was known as the Duke of Edinburgh from 1866 until he succeeded his paternal uncle Ernest II as the reigning Duke of Saxe- Coburg and Gotha in the German Empire.
William Ernest, Duke of Saxe-Weimar
William Ernest, Duke of Saxe- Weimar( 19 October 1662 – 26 August 1728) was a duke of Saxe- Weimar.
John Ernest, Duke of Saxe-Coburg
John Ernest  (10 May 1521 – 8 February 1553) was a Duke of Saxe-Coburg.
John Ernest was born in Coburg as the third (but second surviving and the youngest) son of John, Elector of Saxony, and his second wife Margaret of Anhalt-Köthen.
After the death of his father (1532), his half-brother, John Frederick I, became Elector of Saxony.
For the first ten years, John Frederick shared the rule (but not the Electoral dignity) with John Ernest.
In 1542 John Frederick I decided to rule alone, and ceded the Franconian areas of the Wettin family lands (Coburg and Eisfeld) to John Ernest.
However, it was not until Battle of Mühlberg in 1547, in which the elder brother was captured by Emperor Charles V, that John Ernest could govern undisturbed in Coburg.
John Ernest married Catherine, daughter of Philip I, Duke of Brunswick-Grubenhagen, but the marriage was childless.
After his death in Coburg, the city fell for a few months to John Frederick — released from the imperial detention — before his death, and then, to his three sons, which governed the Ernestine lands together from 1554 for some years.
John Ernest IV, Duke of Saxe-Coburg-Saalfeld
Johann Ernest IV, Duke of Saxe- Coburg- Saalfeld( 22 August 1658 in Gotha – 17 February 1729 in Saalfeld) was a reigning duke of Saxe- Coburg- Saalfeld.
Christian Ernest II, Duke of Saxe-Coburg-Saalfeld
Christian Ernst II, Duke of Saxe-Coburg-Saalfeld (Saalfeld, 18 August 1683 – Saalfeld, 4 September 1745), was a duke of Saxe-Coburg-Saalfeld.
Francis Josias, Duke of Saxe-Coburg-Saalfeld
Francis Josias, Duke of Saxe- Coburg- Saalfeld( 25 September 1697, in Saalfeld – 16 September 1764, in Rodach) was a duke of Saxe- Coburg- Saalfeld.

Question: What is the date of death of John Ernest, Duke Of Saxe-Coburg's father?
Answer: 16 August 1532