The Gesta abbatum Sithiensium (Deeds of the Abbots of Saint-Bertin) is a combination of chronicle and cartulary. Folcuin incorporates numerous charters from the abbey's archives into his historical narrative, which begins with the abbey's foundation around 650 and continues to 961/2. It was composed at the request of the lay abbot, Adalolf.
Folcuin also wrote the Gesta abbatum Lobiensium (Deeds of the Abbots of Lobbes).
- "Folcuin of St. Bertin". doi:10.1163/2213-2139_emc_SIM_01716. Cite journal requires
- Rembold, Ingrid (2018-05-03), Screen, Elina; West, Charles (eds.), "History and (Selective) Memory: Articulating Community and Division in Folcuin's Gesta abbatum Lobiensium", Writing the Early Medieval West (1 ed.), Cambridge University Press, pp. 64–79, doi:10.1017/9781108182386.006, ISBN 9781108182386, retrieved 2019-04-09