Friesian School
Fresian School: Rome and Romania
This article, which is provided for by the Fresian School, covers a large part of Roman history, but pays particular attention to the reign and effects of Emperor Nero.
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: Edicts Against Christians
This site from the Fordham University provides some primary source documents on Emperor Diocletian. Great information, and it shows the level of persecution against the Christians in ancient Rome.
Other
The Latter Rain: Constantine
This extensive resource documents the life of Constantine. Article is written from a Christian perspective. It goes into depth about the freedom he gave to Christians, and the effects of the Edict of Milan.