"Johann Philipp (25 January 1597 – 1 April 1639), was a duke of Saxe-Altenburg.
He was born in Torgau, the eldest (but fourth in order of birth) ...
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surviving son of Friedrich Wilhelm I, Duke of Saxe-Weimar and Anna Maria of the Palatinate-Neuburg, his second wife." - (en.wikipedia.org 08.03.2020)
