Charles De Geer

Charles De Geer, born on February 10, 1720, in Sweden, emerged from a distinguished Swedish-Dutch lineage. His formative years were spent in the Dutch Republic, but at the age of eighteen, he returned to Sweden, where he would establish a remarkable legacy. Taking charge of the Lövstabruk ironworks, he became a prominent industrialist, leading one of the earliest industries in Sweden and employing around three thousand individuals. His success in business positioned him among the wealthiest men in the country, and he later attained the title of friherre, or baron, in 1773.

De Geer's passion for natural history, particularly entomology, blossomed during his youth and evolved into a serious scientific endeavor upon his return to Sweden. His contributions to the field were significant; he was elected to the Royal Swedish Academy of Sciences in 1739 and became a corresponding member of the French Academy of Sciences in 1748. His seminal work, Mémoires pour servir à l'histoire des insectes, published in French across eight volumes from 1752 to 1778, detailed the behaviors of over one thousand four hundred insect species. Through his writings, he highlighted the crucial role of insects as pollinators and challenged the prevailing notion of spontaneous generation.

In addition to his scientific pursuits, De Geer was an avid book collector. His extensive library served as a vital resource for his research and encompassed a wide array of subjects in multiple languages. The collection, which included rare and sumptuous works, was not only a testament to his scholarly interests but also a means to elevate his social standing as an aristocratic collector. Since 1986, his library has been housed at Uppsala University Library, although much of it remains in situ at Lövstabruk, in the pavilion he constructed specifically for this purpose.