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Concept
Ismaël Bullialdus
Summary
Ismaël Boulliau (buljo; Latin: Ismaël Bullialdus; 28 September 1605 – 25 November 1694) was a 17th-century French astronomer and mathematician who was also interested in history, theology, classical studies, and philology. He was an active member of the Republic of Letters, an intellectual community that exchanged ideas. An early defender of the ideas of Copernicus, Kepler and Galileo, Ismael Bullialdus has been called "the most noted astronomer of his generation". One of his books is Astronomia Philolaica (1645).
Ismael Bullialdus was the second-born to his Calvinist parents, Susanna Motet and Ismael Bullialdus. His father was a notary by profession and an amateur astronomer who made observations in Loudun, France. His older brother was originally named after their father Ismael, but died shortly after birth.
At the age of 21, Bullialdus converted to Roman Catholicism and was ordained at age 26. One year later, in 1632, he moved to Paris. Enjoying the patronage of the de Thou family, Bullialdus worked for 30 years in Paris as a librarian associated with the brothers Jacques and Pierre Dupuy, who were working on the Bibliothèque du Roi (Bibliothe), France's first royal library. After the death of his employers, the brothers Dupuy, Bullialdus became secretary to the French ambassador of Holland. After a dispute with him in 1666, however, he once again moved, this time to the Collège de Laon, where he worked again as a librarian.
Bullialdus published his first work De Natura Lucis in 1638, which he followed with many more published works, ranging from books to published correspondence during his time involved with the Republic of Letters. He was one of the earliest members to be elected as a foreign associate into the Royal Society of London on April 4, 1667, only seven years after the Society was founded. He spent the last five years of his life as a priest, the same occupation in which he started his career.
He retired to the Abbey St. Victor in Paris, where he died at the age of 89.
Official source
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