Marcin Bylica

• 1. Introduction

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  Marcin Bylica was born around 1433 in the Polish mining town of Olkusz, and by the time he died in Buda in 1493, he had stood at the center of some of the most consequential astronomical work of the fifteenth century. His father Jan was a burgher who looked after the local waterworks. Nothing about that modest origin pointed toward a life spent advising kings and collaborating with the greatest mathematical minds of the age.

  How did a waterworks caretaker's son from Olkusz end up as the personal astrologer to a king of Hungary? What tables did Bylica help calculate that were still being printed a century and a half after his death? And what collection of books and instruments did he leave behind that still survives today? Those are the threads this documentary follows.

• 2. From Olkusz to Bologna

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  Bylica's education almost certainly began at the parish school in Olkusz before he moved on to the University of Cracow. There he studied under Marcin Król z Żurawicy, one of the leading astronomers of the day. That training gave Bylica a foundation rigorous enough to attract the attention of Johannes Lauratius de Fundis, who invited him to teach astronomy at the University of Bologna in 1463.

  Teaching at Bologna placed Bylica within one of Europe's most prestigious centers of learning. Within a year of his arrival in Italy, he had moved to Rome, where he served as astrologer to a cardinal. The source records two candidates for that patron: Pietro Barbo, who was elevated to the papacy as Paul II in 1464, or Rodrigo Borgia, who would later become Pope Alexander VI. Either connection would have placed Bylica at the very heart of Renaissance power.

• 3. The Regiomontanus Partnership

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  Rome is where Bylica met Johannes Regiomontanus, and that encounter set the course of his intellectual life. The two men began a collaboration that produced astronomical tables and a joint work with the unwieldy Latin title Disputationes inter Viennensem et Cracoviensem super Cremonensia in planetarum theoriae deliramenta. Translated, that title means Dialogues between a Viennese and a Cracovian about Gerard of Cremona's thoughts on planetary theories. It was a direct critique of an astronomy text that the pair considered outdated.

  The partnership did not stay in Rome. Both men were summoned north by John Vitéz, archbishop of Esztergom, and his nephew Janus Pannonius, bishop of Pécs, who had recently founded a university in Presburg known as the Universitas Istropolitana. Working in John Vitéz's palace at Esztergom, which housed an astronomical observatory, Bylica and Regiomontanus completed the Tabulae directionum et profectionum in 1467. These tables were designed to let astrologers calculate predictions from a person's date of birth. They went on to be printed in eleven editions by 1626, spanning a century and a half of continuous use.

• 4. Winning the King's Favor

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  In the spring of 1468, Bylica's standing changed decisively. A public disputation took place, almost certainly in Presburg, before Matthias Corvinus, King of Hungary, and his assembled court. The subject was the horoscope of the conception of the son of count János Rozgon, and Bylica's opponent was his colleague Johannes Stercz. By Bylica's own account of the contest, Stercz was humiliated.

  Matthias declared Bylica the winner and awarded him 100 florins on the spot. The prize mattered less than what followed: Bylica became the official astrologer of the king of Hungary and went on to serve as one of Corvinus' closest councilors. The man from Olkusz had become indispensable to one of central Europe's most powerful rulers.

• 5. A Legacy in Books and Brass

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  When Bylica died in Buda in 1493, he did not leave his possessions to the Hungarian court that had employed him for a quarter century. He bequeathed his collection of books and astronomical instruments to the university in Cracow, where his own education had begun. That collection survives to this day.

  The books included works by Regiomontanus and Georg von Peuerbach, the two figures who had done most to modernize astronomical theory in the fifteenth century. Also in the collection was the Tractatus Astrarii by Giovanni Dondi dell'Orologio, the celebrated fourteenth-century clockmaker whose writings bridged timekeeping and celestial observation. During the last year of Nicolaus Copernicus in 1494, a large globe, two astrolabes, and a triquetrum that had belonged to Bylica were brought as a gift to the University of Cracow. Those instruments reached Cracow just as the young Copernicus was completing his studies there, placing Bylica's tools in the hands of the generation that would transform astronomy entirely.