John Ernest, Duke of Saxe-Coburg

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John Ernest
Duke of Saxe-Coburg
Landgrave of Thuringia
1521 Johann Ernst.JPG
Reign 1542–1553
Predecessor John Frederick I
Successor John Frederick II
Born (1521-05-10)10 May 1521
Died 8 February 1553(1553-02-08) (aged 31)
Spouse Catherine, daughter of Philip I, Duke of Brunswick-Grubenhagen
House House of Wettin
Ernestine Line
Father John, Elector of Saxony
Mother Margaret of Anhalt-Köthen
Religion Lutheranism

John Ernest (German: Johann Ernst) (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, assumed the title of Elector of Saxony; John Ernest took part with him in the rule over the Electorate of Saxony.

In 1542 John Frederick I decided to rule alone, and ceded to John Ernest the Franconian areas of the Wettin family lands (Coburg, Eisfeld, etc.); but it was not until 1547 (after the Battle of Mühlberg) when John Ernest could govern undisturbed in Coburg. He 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 — dismissed from the imperial detention — before his death, and then, to his three sons, which governed the Ernestine lands together from 1554 for some years.