The Libellus constructionis Farfensis ("Little Book of the Construction of Farfa"), often referred to simply as the Constructio in context, is a written history of the Abbey of Farfa from its foundation by Thomas of Maurienne circa 700 until the death of Abbot Hilderic in 857. It is about the "construction" of a powerful abbey with vast landholdings. It was used as a source for two later histories, which are basically continuations: the Destructio monasterii Farfensis of Abbot Hugh (died 1039) and the Chronicon Farfense by Gregory of Catino (died 1133).