The laws of the land they come to be called. Those social directives that helps stabilize and hold together a culture. The ancient laws of Wales were organized around 850 AD. A fellow named "Hywel Dda" is credited with such an activity. These have been translated from the Welsh and published as "Hywel Dda The Law". The cover of my copy is shown below.
For those who might want to study the Welsh tribal system and its social directives, this book is for you. First published by Gomer Press, Llandysul, Dyfed in 1986. It is translated by Dafydd Jenkins and contains the law texts from medieval Wales.
For my own Welsh genealogy, it is recorded that Hywel Dda was the father-in-law to Tudor Trevor, the beginning of my Welsh family tree. How about that, a father-in-law from the past! This text has served me well to help understand the culture of this beginning.