The Coronation Oath, or Charter of Liberties as they were often called, defined the meaning of kingship. In Edgar’s time there are three basic commitments; later kings would add a fourth, slightly self-serving promise, to protect the rights of the crown.
The Coronation Oath of King Edgar
In the name of the Holy Trinity. I promise three things to the Christian people subject to me:
Firstly, that God’s church and all the Christian people of my dominions will be held in true peace
Secondly, I forbid robbery and all unlawful deeds by all ranks of men.
Thirdly, I promise and command justice and mercy in all judgments, in order that the gracious and merciful lord, who liveth and reigneth, may thereby forgive us all through his everlasting mercy.