Authorised form of nameBullialdus; Ismael (1605 - 1694); astronomer and mathematician
Other forms of surnameBoulliau
Dates1605 - 1694
Place of birthLoudun, France, Europe
Date of birth28 September 1605
Place of deathAbbaye St-Victor, Paris, France, Europe
Date of death25 November 1694
OccupationClergyman, Roman Catholic; Diplomat
Research fieldMathematics; astronomy
Loudun; Poitiers; Paris
Travelled in Italy, Germany, Poland and to the Levant, as ambassador of King Casimir; converted to Roman Catholicism (1626); worked as a librarian with the brothers Dupuy at the Bibliothque du roi (1632-1662); secretary to the French ambassador of Holland (1662-1666); librarian at Collge de Laon (1666); published multiple works on astronomy
Membership categoryFellow
Date of election04/04/1667
Age at election66
ProposerHenry Oldenburg
Other Royal Society activityActed as an occasional correspondent, in particular on astronomical observations and tables (1670s)
RelationshipsParents: Ismael Boulliau and Susanna Motet
Published worksRCN: 30853
RCN: 31934
RCN: R64842
RCN: 30854
RCN: 30855
RCN: 30856
RCN: 30857
RCN: 30858
General contextBullialdus was considered one of the most noted astronomers of his generation and enjoyed lifelong friendships with Pierre Gassendi, Marin Mersenne, and maintained correspondence with Johannes Hevelius (FRS 1664), Henry Oldenburg (FRS 1663), and Christian Huygens (FRS 1663). He was heavily involved in the correspondence network 'Republic of Letters', many letters of which survive at the National Library in France. His most important work is considered to be 'Astronomia philolaica' (1645) on planetary systems. Although he enjoyed a good reputation as an astronomer, his theories, including one of a new cosmology which went against Kepler's theories, were critiqued by some fellow astronomers.
Related imagesDiscover a selection of related images in our picture library

Bouillaud I, IM006226.jpg

Bulloch's Roll; DSB; Biographie Universelle; Hunter; Biographical Encyclopedia of Astronomers
Da Costa Andrade, E N. 1963. 'Samuel Pepys and the Royal Society', in Notes and Records, vol. 18, pp. 82-93
Virtual International Authority File
Royal Society codeNA5773
Archives associated with this Fellow
Reference numberTitleDate
RBO/4/36'Mons Bullialdus's Calculation of the Lunar Eclipse of September 18 1671 from the Philolaic Tables'1671
RBO/4/37'Mons Bullialdus his Calculation of the places of the Sun and Moon on April 22 1671 from the Philolaick Tables'1671
LBO/2/8Copy letter from Ismail Bullialdus to Henry Oldenburg16 May 1667
LBO/2/5Copy letter from Henry Oldenburg to Ismail Bullialdus 22 April 1667
LBO/2/9Copy letter of Ismael Bullialdus to the Royal Society16 May 1667
LBO/7/99Copy letter from Henry Oldenburg, London, to Ismail Bullialdus 18 February 1675
CLP/4i/18/2Drawing, Mira of Cetus[c17th Century]
CLP/4i/18/1Manuscript, concerning an astronomical observation on 4 March [c17th Century]
CLP/8i/27/2Diagram and philolaic tables by Ismael Bullialdus1671
CLP/8i/17Paper, observations of nebula in the constellation andromedae and stars in the neck of the constellation cetus seen in 1667 by Ismael Bulialdus1667
CLP/8i/27Paper, computation of the sun and moon from the Philolaick tables by Ismael Bullialdus1671
CLP/8i/27/1Manuscript, computation of the sun and moon from the Philolaick tables by Ismael Bullialdus1671
CLP/4i/18Paper, concerning an astronomical observation on 4 March [c17th Century]
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