Heresy 2.0

Stifling heresy old style: knights led by the bishop against heretics in a 14th-century copy of Gratian's influential work Decretals, Paris, Bibl. Mazarine, 1291

We might be in the best position today to understand why theologians, thinkers and leaders in the late antique and medieval period cared so much about heresy. And that is not necessarily because…