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Georg Joachim Rheticus
Georg Joachim de Porris, also known as Rheticus (16 February 1514 – 4 December 1574), was a mathematician, cartographer, navigational-instrument maker, medical practitioner, and teacher. He is perhaps best known for his trigonometric tables and as Nicolaus Copernicus's sole pupil.〔Danielson, p. 3.〕 He facilitated the publication of his master's ''De revolutionibus orbium coelestium'' (''On the Revolutions of the Heavenly Spheres'').
==Surname==
Rheticus was born at Feldkirch, in present-day Austria. Both his parents, Georg Iserin and Thomasina de Porris, possessed considerable wealth, his father being the town physician. However, Georg (Iserin) abused the trust of many of his patients, stealing belongings and money from their homes. In 1528 he was convicted and executed for his crimes, and as a result his family was stripped of their surname.〔Danielson, pp. 15–17.〕
The family adopted the mother's maiden name: de Porris. Later as a student in Wittenberg Georg Joachim adopted the toponym Rheticus, a form of the Latin name for his home region, Rhaetia, a Roman province that had included parts of Austria, Switzerland and Germany. In the matriculation list for the University of Leipzig his family name, de Porris, is translated into German as von Lauchen. The lunar crater Rhaeticus is named for him.〔.〕
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