[ Autographs ] RUDOLF II (1552 - 1612) Holy Roman Emperor and King ofGermany; the patron of German astronomer Johannes Kepler. Beautiful calligraphic D.S. "Rudolf" 4pp. folio, [n.p.], March 22, 1580, in OldGerman, untranslated. With the original transmittal envelope bearing his large, blind embossed seal. In fine condition, and unusually attractive.