How to solve a medieval murder

Taggart voice There's been a murder!
Medieval life was full of murders! People were getting knifed all the time mate. But who was responsible for sorting the guilty from the innocent? What do God and intimate social knowledge have to do with it? And is this all a thinly-veiled excuse for Aran to do his incredible Poirot impression?
For more information, see the University of Cambridge's Medieval Murder Maps:
medievalmurdermap.co.uk