| John Philip | |
|---|---|
| Duke of Saxe-Altenburg | |
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| Reign | 1603–1639 |
| Predecessor | John |
| Successor | Frederick William II |
| Spouse | Elisabeth of Brünswick-Wolfenbüttel |
| Issue | |
| Elisabeth Sophie, Duchess of Saxe-Gotha-Altenburg | |
| House | House of Wettin |
| Father | Frederick William I, Duke of Saxe-Weimar |
| Mother | Anna Maria of the Palatinate-Neuburg |
| Born | 25 January 1597 Torgau |
| Died | 1 April 1639 (aged 42) Lutheranism |
John Philip, Duke of Saxe-Altenburg (Torgau, 25 January 1597 – Altenburg, 1 April 1639), was a duke of Saxe-Altenburg.
He was the eldest (but fourth in order of birth) surviving son of Frederick William I, Duke of Saxe-Weimar and Anna Maria of the Palatinate-Neuburg, his second wife.
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When his father died (1602), John Philip and his younger brothers Frederick, John William and Frederick William were underage. Because of this, his uncle John (more interested in natural sciences and art than politics) took over his guardianship and the regency of his inheritance; but shortly after he took all the duchy of Saxe-Weimar into his own hands.
The next year (1603), the young prince of Saxe-Weimar demanded his own inheritance, but his uncle John opposed this. But finally, both parts made a divisionary treaty of the family lands: John Philip and his brothers took Altenburg and some towns, and John retained Weimar and Jena.
Because they were still underage, the regency of his duchy was taken by Christian II, Elector of Saxony (1603–1611) and later by his brother and next Elector, John George I (1611–1618).
In 1618, John Philip, as elder son, was declared adult and assumed the government of the duchy of Saxe-Altenburg. Also, he took over the guardianship of his younger siblings. The four brothers co-ruled the duchy, but two of them died soon after and childless: Frederick, who was killed in action in 1625, and John William, died in Brieg on 1632.
John Philip and his only surviving brother, Frederick William II, continued as co-rulers; but, in fact, it was John Philip who really assumed the supreme and full control of the government until his death.
In 1613, John Philip was appointed Dean of the University of Leipzig. Also, he was an active member of the Fruitbearing Society.
In 1638, he received the towns of Coburg, Bad Rodach, Römhild, Hildburghausen and Neustadt, according to the divisionary treaty between him and the branch of Saxe-Weimar after the death of the duke John Ernest of Saxe-Eisenach without surviving issue.
Before his death, he made a will, when he declared his daughter the general heiress of the branch of Saxe-Altenburg, only in case of extinction of the male issue of the family. This will later originated a dispute between the branches of Saxe-Gotha and Saxe-Weimar.
John Philip was succeeded by his younger and only surviving brother, Frederick William II.
In Altenburg on 25 October 1618 John Philip married Elisabeth of Brunswick-Wolfenbüttel (dowager sister-in-law of his former regents, the Electors of Saxony Christian II and Johann Georg I). They had only one daughter:
| Preceded by John |
Duke of Saxe-Altenburg 1603–1639 |
Succeeded by Frederick William II |