Didymus probably wrote a treatise called "On The Holy Spirit" (written sometime before 381 in Greek), which was preserved in a Latin translation by Jerome. "Commentary on the Catholic Epistles" also is dubiously attributed to Didymus. The treatise "Against the Manichees" was also probably written by Didymus. There has been greater doubt over two further works traditionally attributed to Didymus. "On The Trinity", identified in the eighteenth century as being Didymus' work, saw twentieth-century doubts, largely on grounds of lack of 'provenance' and alleged inconsistencies with the commentaries discovered at Tura in 1941, but many would still see this as Didymus' work. Additionally, scholars do not believe that Didymus authored the work preserved as books 4 and 5 of Basil's "Against Eunomius".