Jean Taisnier
Belgian/German mathematician, astrologer, writer
Jean Taisnier (or Taisner) (Latin: Johannes Taisnierius; 1508, Ath, Habsburg Netherlands – 1562, Cologne), surnamed Hannonius (i.e., of the County of Hainaut), was a Wallonian musician, mathematician and astrologer who published a number of works and taught in various European cities and universities. In some sources he is mis-named Jean Fuisnier. He was for some time schoolmaster of the boys of the Chapel (Sacellanus) in the court of Emperor Charles V. By 1559 he styled himself "Poet Laureate" (a laureation of the Holy Roman Empire), and "Doctor of both Laws", but upon what authority is unknown. While he propounded a general theory of Mathematics in four "Quantities" of Astronomy, Geometry, Arithmetic and Music, and aimed to publish a general exposition of them, he became preoccupied with astrology and cheiromancy, and neglected to publish his advertised Treatise on Music which (given his experience) might have been the most interesting of all his works. His unacknowledged use of the work of other authors has incurred the accusation of plagiarism. He was the great-uncle of David Teniers the Elder.
Life
Origins and education
John, or Jehan, Taisnier was one of the children of Thomas Taisnière, a successful Wallonian merchant who owned various properties near the market-place of the city of Ath, and his wife, demoiselle Cathérine de l'Issue. The families were long-established in that place. He had a sister Françoise and brothers Joachim (Taynière) and Pierchon. These relationships are illustrated in a series of deeds in the archives of Ath: they show that father Thomas died before 4 October 1522, when Joachim, the eldest son, succeeded him as "matricularius" or parochial clerk for registrations, of the church of Saint-Julien (an office held by contract).
The public source identifies “Jean Taisnier” as belgian/German mathematician, astrologer, writer. This brief keeps that definition visible, then builds a research path around Jean, Taisnier and Belgian.
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The entry’s evidential value lies in the named roles, institutions and publications that can be tested against primary documentation. The source revision retrieved here is dated May 12, 2026. The linked authority identifier is Q2383250. VIAF identifies the subject as 57347936. The Library of Congress control number is nr93009793. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1508, 1562, 1559 and 1522.
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This entry incorporates text from “Jean Taisnier” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.