The Paris University Purge was a purge of magi by the newly-formed Order of Reason in 1330.
The Purge started on March 21, with the assassination-by-Scourge of Andreas Litolff bani Bonisagus, followed by a general pogrom. The Cosians and Gabrielites started with Paris University proper, and proceeded to spread out through the city of Paris, hunting magi.
The Purge finally ended nearly a month later, on April 18, when the Hermetic Le Ictus Covenant was destroyed. [1]