César-Egasse du Boulay (died 1678), known as Bulaeus, was a French historian.
He was born at the beginning of the seventeenth century at Saint-Ellier, Mayenne. After teaching humanities in the College of Navarre he occupied important positions in the University of Paris, including those of rector and historian of the university. He died on 16 October 1678.
His main work is the Latin: Historia Universitatis Parisiensis, covering the period from the supposed foundation of the university by Charlemagne (800) to 1600. The first three volumes published in 1665 were censured by the university. To justify himself, the author wrote the Latin: Notæ ad censuram ... (Paris, 1667). The censors appointed by the king found nothing blameworthy in the work, and the last three volumes were published in 1673. The 1913 Catholic Encyclopedia describes this history as "important on account of the many original documents which it reproduces", but criticizes the "poor judgment of the author."
Other writings of Du Boulay refer to the same topic of the university, its foundation, patrons, administration, and privileges:
In addition to these Du Boulay wrote Latin: Speculum eloquentiæ (1658) and French: Trésor des antiquités romaines (1650).