 During the Oxford period (after 1250) Kilwardby wrote an array of disparate works: De natura relationis, Quaestiones in quattuor libros Sententiarum, De 43 questionibus, and Epistola ad Petrum de Confleto. All these works have been edited, even if not all in a critical edition. From the same period are also some minor theological works such as De confessione, De necessitate Incarnationis, De conscientia et de synderesi, the Tabulae super originalia patrum, the Arbor consanguinitatis et affinitatis, and some sermons—the Sermo in capite ieiunii and the Sermo in dominica in Passione. The two sermons have been edited, as well as the work on the necessity of the Incarnation. Worth mentioning is a letter expressing some criticism over Franciscan poverty (Epistola ad novitios de excellentia Ordine Praedicatorum), which survives in John Pecham’s answer (Tractatus contra fratrem Robertum Kilwardby), edited in Pecham’s Tractatus tres de paupertate.