The old logic (ars vetus, logica vetus is the corpus of Aristotelian logic that survived in the Latin West after the fall of the Roman empire. It contrasts with the 'new logic' (logica nova), the work of Aristotle that was recovered in the twelfth century. The old logic consisted of

The Categories
The Perihermenias (also known as De Interpretatione)
The Isagoge of Porphyry
The Liber sex principiorum, an anonymous commentary on the latter part of the Categories that has often been attributed to Gilbert de la Porrée.
Sometimes included were the following works of Boethius: De topicis differentiis, De divisione, De syllogismis categoricis and De syllogismis hypotheticis.

Other late Roman works that influenced the scholastic tradition

THE LOGIC MUSEUM Copyright (c) E.D.Buckner 2010.