Tractatus Monacenses, Summa Ignoti and Summulae Antiquorum | Steen Ebbesen

The Dialectica Monacensis, a collection of logical treatises edited by L.M. de Rijk in 1967, has been pivotal in reconstructing the evolution of medieval logic. However, less attention has been given to the accompanying Tractatus Monacenses, preserved in the same singular manuscript. This volume presents the first complete edition of the Tractatus Monacenses and demonstrates that, while not homogeneous, the collection took its final form within the same intellectual environment as the Dialectica Monacensis. The volume argues convincingly that this environment was a German cathedral school around 1230, challenging de Rijk's earlier assertion of an English origin around 1160–1170. Additionally, the volume includes editions of three key texts integral to de Rijk's investigation into the sources of Peter of Spain’s renowned Tractatus: Quaestiunculae super Summam Ignoti, fragments of Summa Ignoti found within the Quaestiunculae, and Summulae Antiquorum. Together with an extensive introduction, these editions lay the foundation for a re-evaluation of the history of terministic logic, offering an alternative to the longstanding framework established by de Rijk's investigation into the sources of Peter of Spain's renowned.