This incident is recounted in the book, “Hell: If There Is One, What is It, and How to Avoid It” by Monsignor Louis-Gaston de Ségur in 1876.

"In the life of St. Bruno, founder of the Carthusians, there’s a story which has been studied very thoroughly by the very doctors of the Church, and which presents itself to the most formal criticism of all the historical characters of authenticity; an event that occurred in Paris in the middle of the day, in the presence of many thousands of witnesses, whose details have been collected by its contemporaries, and which has given rise to a great religious Order.

A famous doctor from the University of Paris named Raymond Diocres had just died, leaving universal admiration among all his students. The year was 1082.

One of the wisest doctors of that time, known throughout Europe for his science, his talent and his virtues, named Bruno, was then in Paris with four companions, and it became a duty to attend the funeral of the illustrious deceased.
The body had been laid in the great hall of the Chancellery near the Church of Our Lady, and an immense crowd respectfully surrounded the bed, in which, as is the custom of that time, was exposed the deceased covered with a full face veil..."

Attribution for creative commons photo used:
Paolo brondo e gualtieri di fiandra, vetrate del palatoio della certosa di firenze, 1560, funerali di Raymond Diocrès, prima scena, 01.jpg
by Sailko
CC BY 3.0
https://creativecommons.org/licenses/by/3.0/deed.en