Astesanus de Ast
(died c. 1330) was an important Franciscan canon lawyer
and theologian, from Asti
. His major work is Summa de casibus conscientiae
(Cases of conscience), a confessional work, in manuscript from around 1317 and comprising eight volumes and three indices. Its writing is said to have been at the prompting of Cardinal Giovanni Gaetano Orsini
It is often referred to as the Summa Astesana. The parts named De significatione verborum are a reference for the legal usage of his period, for both civil and canon law. The Canones penitentiales are also cited separately.
It was printed at Strasbourg at the end of the 1460s by Johannes Mentelin, Lyons 1519; Rome 1728-30.
- J. Dietterle, Die "Summae confessorum (sive de casibus conscientiae)" von ihren Anfängen an bis Silvester Prierias, ZKG 26 (1905) 35-62.
- P. Michaud-Quantin, Sommes casuistique et manuels de confession au moyen âge (Louvain - Lille - Montreal 1962) 57-60.
- J. Sbaralea, Supplementum ad scriptores ordinis minorum I (Rome 1908) 104-05