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.
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.
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.
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.
Margaret of Anhalt-Köthen
Margaret of Anhalt (12 November 1494, Köthen – 7 October 1521, Weimar) was a member of the House of Ascania and was a princess of Anhalt by birth and by marriage Duchess of Saxony.
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.
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.
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.
Princess Victoria of Saxe-Coburg and Gotha
Princess Victoria of Saxe- Coburg and Gotha( Victoria Franziska Antonia Juliane Luise; 14 February
1822 – 10 November 1857) was the daughter of Prince Ferdinand of Saxe- Coburg and Gotha and Princess Maria Antonia Koháry.
Her father was the second son of Francis, Duke of Saxe- Coburg- Saalfeld and Countess Augusta Reuss of Ebersdorf.
William Ernest, Duke of Saxe-Weimar
William Ernest, Duke of Saxe- Weimar( 19 October 1662 – 26 August 1728) was a duke of Saxe- Weimar.

Question: Where was the place of death of John Ernest, Duke Of Saxe-Coburg's mother?
Answer: Weimar