"[Alfred] is generally credited with establishing trial by jury, the law of "frank-pledge", and many other institutions which were rather the development of national customs of long standing.."
But he is responsible for the first common law (which united all the laws of england or anglo-land), which traced their roots to the Bible. Also, he first translated part of the Bible into (old) english, and he wrote a number of Christian writings including poetry (you can read a volume or two of these online).
Jury trial as a set of twelve men probably can be traced all the way to the Bible. They can be contrasted to town courts, where everyone is part of the decision making instead of a set of representatives. A good study of Alfred would probably contrast him with other Christian kings at the time, including Charlemagne. At this time, there was no split between the churches.
And for the support of this Declaration, with a firm reliance on the protection of Divine Providence, we mutually pledge to each other our lives, our fortunes and our sacred honor.
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