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Johannes Müller von Königsberg (June 6, 1436 - July 6, 1476), Latin name Regiomontanus, was an important mathematician and astronomer of the 15th century. He was born in Königsberg, Archbishopric of Mainz, Franconia (now in Bavaria).

He is also called Johannes Müller, die Koenigsberger. His Latin full name is Joannes de Regio monte, which shortens to Regiomontanus (translation of "Königsberg" or "King's Mountain").

A son of a miller, at eleven years of age, he became a student at Leipzig, Saxony university. Three years later he continued his studies at the Alma Mater Rudolfina in Vienna, Austria. There he became a pupil and friend of Georg von Peurbach[?]. In 1457 he built an astrolabium, in 1465 a portable sundial for pope Paul II[?]. From 1461-65 Johannes Müller or Regiomontanus lived and worked at Cardinal Bessarian[?]'s house in Rome. From Rome he went to work at the court of Matthias I, King of Hungary[?]. He calculated and made extensive astronomical tables. He also built astronomical instruments.

In 1471 Johannes Müller moved to the Free City of Nuremberg in Franconia, which at that time was one of the most important places of learning, publication, commerce, artistry etc of the empire. Regiomontanus remains known for building the first Astronomical observatory of Germany, perhaps of Europe, at Nuremberg. He made and printed many astronomical charts.

1475 he went and worked with pope Sixtus IV[?] in Rome on Calendar Reform[?]. While in Rome, Müller died in 1476 in Rome of mysterious circumstances, some say of the plague.

Domenico Maria Novara da Ferrara, the teacher of Nicolaus Copernicus, referred to Regiomontanus as having been his teacher.

Johannes Müller was internationally famous already during his lifetime. He was a very active writer. Despite his plans for writing four times the volume he acually did get to finish, he left us a number of works.

After his death he became known for the place of his birth, Koenigsberg or in Latin: Regiomontanus.

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