Rudolph II, Holy Roman Emperor from 1576 to 1612 and the elder brother of Matthias, Archduke of Austria and Holy Roman Emperor from 1612 to 1619. The Habsburg princes Rudolph and Matthias didn’t get on. Matthias became HRE when Rudolph died.
Footnote a
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The Somnium Project is an ongoing effort to fully translate into English the Somnium, which Kepler wrote in Latin between 1600 and his death in 1630.
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