 From Marchia’s Parisian lectures of 1319–20 we have a popular commentary on all four books of the Sentences, extant in at least ten manuscripts for each book, with two distinct redactions of book I and two differing versions of books III and IV, alongside various abbreviations (on Marchia’s works, see Friedman-Schabel 2001 and Marchia 2008, xix–xxiii). Manuscript Vat. lat. 943 preserves a full redaction of book II and fragments of the other three books of a commentary on the Sentences that Marchia may have composed outside Paris after studying there, so this could represent Marchia’s early teaching, although it may also be connected with his Paris lectures themselves. Marchia’s sole Quodlibet was probably held in Marchia’s Paris period as well, rather than in Avignon as previously thought, although the first two questions in the modern edition do not belong to Marchia’s text but to John Duns Scotus’ Sentences commentary (Duba 2007, 2008). It is difficult to date Marchia’s literal commentary on the Physics, his short commentary on the first two books of the Metaphysics, and his related question commentary on the first seven books of the Metaphysics. The question commentary had been dated to before 1323, but this was based on the erroneous terminus ante quem of 1323 for the question commentary on the Physics of ‘John the Canon’, actually Francis Marbres, which cites explicitly and copies from Marchia’s Metaphysics questions. Marbres actually composed his work after 1325 and probably around 1330 (Duba 2014a, 445–6; Schabel 2014).