[1] During his time at Saint-Riquier, Hariulf wrote a chronicle of the abbey at the request of his fellow monks.
The original Chronicon Centulense (also called Gesta ecclesiae Centulensis) cover the years 625–1088.
It was translated into Old French and continued down to 1437 by an anonymous monk of Saint-Riquier, but this version has been lost.
Hariulf's autograph manuscript was lost to fire in 1719, but was copied by André Duchesne.
[2] At Oudenburg, Hariulf wrote a biography of Bishop Arnold of Soissons in support of his canonization.