Giovanni de Galliano Pieroni

Giovanni de Galliano Pieroni (1586–1654) – military engineer specializing in erecting fortifications (authored Trattato delle fortificazioni moderne), architect, mathematician and astronomer who gained particular fame in his day as also as author of horoscopes. Just the same he was a practicing astronomer and a contemporary and a friend of Johannes Kepler (1571-1630) while both spent time in Prague. Earlier he became friendly with the astronomer, mathematician and physicist Galileo Galilei (1564-1642) – like Pieroni, Galileo also wrote on constructing fortifications, and the two shared interest in mathematics and astronomy.


View of Ljubljana, drawn by Giovanni Pieroni. Pieroni travelled around the Habsburg Monarchy as a military engineer, and left a series of drawing and sketches of Central European towns and fortresses.

Pieroni was born in Florence on 5 March 1586.[1] His childhood and education was privileged, in that his father Alessandro Pieroni (1550-1607) was an architect at the court of the Medici. After studying law, in 1608 he was awarded a doctorate in law in Pisa. He studied under Bernardo Buontalenti (1531-1608). During that time he befriended Galileo, who served then the Tuscan Grand Duke, Cosimo II di Medici. The two corresponded for many years, even after Pieroni left Florence.

He spent a lot of time working for general Albrecht of Wallenstein (1583–1634), in Vienna and Prague, fixing up fortifications of castles and in that vein, of palace and park grounds, particularly the Wallenstein Palace, collaborating with great baroque Italian artists and architects. His young assistant in both cities was Baccio del Bianco, who memorably described Pieroni as an "astrological architect".


  1. ^ "Giovanni Pieroni: un informatore mediceo al seguito del generale Wallenstein" (PDF). Esamizdat. Retrieved 14 March 2018.


  • Science in Contact with Art: Astronomical Symbolics of the Wallenstein Palace in Prague, Alena Hadravová (Research Centre for the History of Science and Humanities of the Czech Academy of Sciences and Charles University), Petr Hadrava (Astronomical Institute of the Czech Academy of Sciences), published in: Science in contact at the beginning of scientific revolution, Ed. J. Zamrzlová, Acta historiae rerum naturalium necnon technicarum, New series, Vol. 8 (2004), pp. 173 – 210. ISBN 80-7037-133-1 html version with "Giovanni Pieroni" color-highlighted