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The Laws of Hywel Dda are largely based around the notion of sarhad, a kind of pain level / financial remuneration (a little like the Saxon notion of Wergeld), the payment of which propagated down through the kinships of both victim and perpetrator ensuring a social check on behaviour. This was also tied into a hierarchy of group-oaths, through which innocence could be protested, and geographical zones of protection which varied depending on the rank of the person giving the protection (for example, the Queen could offer protection to the edge of the country, whereas the king's falconer could only protect to where he'd been hunting that day)*.

The laws themselves ranged from some more sensible than today's...

"...a necessitous person who has traversed three settlements, and nine houses in each settlement, without obtaining either alms to relieve him or provisions though he may be caught with stolen eatables in his possession, he is free by law..."*

to the harsh...

"The Physician of the Court...gratuitously attends all officers of the court, for he receives from them nothing but their bloodstained clothes which have been cut with weapons..."*

to perfectly justifiable academic pointers...

"The three oppressors of the wise are: drunkenness, and adultery, and bad disposition."*