I am something more than halfway through John Julius Norwich's Byzantium: The Early Centuries.
Heresy, heresy everywhere. We're up to our necks in heretics: Arians, Nestorians, monophysites.
And all those barbarians: Visigoths, Ostrogoths, Huns.
Western Emperors, Eastern Emperors, and lots and lots of murder -- families, rivals, possible rivals, traitors, so-called traitors, and whole stadia full of people.
And that's just halfway through the first book of the trilogy.