LogFAQs > #889017668

Honestly though, The Council of Nicaea is a pretty safe bet. There will be at least one Christianity focused question. Probably something about the Great Migration, too. I'd also familiarize myself with Charlemagne and the German Kings (IIRC, one wrote a code of laws, but I can't for the life of me remember what it was called). Some medieval classes also cover the fall of Rome (well, technically, Western Rome, as the Byzantines actually called themselves Romans pretty much through their entire existence), so if you remember hearing about it, study up, because they were pretty rife with legal codes (also, IIRC, Justinian wrote a legal code, too).