He is the author of a
Summa in decretum Gratiani (1159), which is to a great extent based on the similar works of
Paucapalea,
Rufinus and Rolandus (occasionally mistaken for
Pope Alexander III). It was first edited by
Johann Friedrich von Schulte (Stephen of Tournai,
Die Summa des Stephanus Tornacensis über das Decretum Gratiani, ed. J.F. von Schulte, Giessen 1891.) His letters, edited by Molinet (Paris, 1679), are printed in
Patrologia Latina, CCXI, 309–625. ==Further reading==