During the Wars of Castro he led papal army cavalry against the Dukes of Parma. He became close to the nephews of Pope Urban VIII and his later correspondence and publications carried the Barberini crest; three bees. His cousin Carlo later received assistance, in Rome, from Barberini loyalist, Cardinal Marzio Ginetti.
Despite the Duchy of Modena having sided with the Dukes of Parma during the Wars of Castro, Malvasia later became a military advisor to Alfonso IV d'Este, Duke of Modena. He was later named Marechal of the French army in Italy while Francesco II d'Este (later Duke of Modena after his father) was General of that army.
Patron of astronomy
Throughout his military career, Malvasia maintained a strong general interest in astronomy, optics and scientific engineering. He is credited with having contributed to the invention of the reticle or "cross-hairs" during the 1620s; final credit is usually ascribed to Robert Hooke.
In 1645 Malvasia invited Giovanni Domenico Cassini to Bologna and offered him a position in his observatory, which was close to completion. Most of their time was spent calculating newer, better, and more accurate ephemerides for astrological purposes using the rapidly advancing astronomical methods and tools of the day. 17 years later, in 1662, their collaborative work, Ephemerides novissimae motuum coelestium, was published by Malvasia. It was dedicated to Cardinal Giulio Cesare Sacchetti - twice nominated by Antonio Barberini as the French candidate for pope - and included a rather laudatory dedication in which Malvasia claimed he could trace Sacchetti's ancestry back to Ancient Roman gods.
Malvasia corresponded with a number of other contemporary astronomers during his development of new methods.
References and notes
- Malvasia's Life of the Caracci by Carlo Cesare Malvasia (conte) & Anne Summerscale (Reprint - Penn State Press, 2000)
- Note: Accounts of Malvasia's work include a description of an early reticle - silver strands crossed at right-angles to separated fields of view when looking through a telescope.
- Biographical Encyclopedia of Astronomers by Virginia Trimble, Thomas Williams, Katherine Bracher, Richard Jarrell, Jordan D. Marché and F. Jamil Ragep (Springer Reference, 20/11/2007)
- Rodolfo Calanca: L'astronomia nel ducato estense tra il XVII ed il XIX secolo (Astronomy in the duchy of Este between the seventeenth and the nineteenth century)
- Note: at the papal conclave, 1644 and the papal conclave, 1655.
- Ave Papa/Ave Papabile: the Sacchetti family, their art patronage, and political aspirations by Lilian H. Zirpolo (2005), p. 17
- National Central Library of Florence: Correspondence from Carlo Manzini to Malvasia in 1650