William I of England, Select Historical Documents of the Middle Ages (1892)
“ Every man who wishes to be considered a freeman shall have a surety, that his surety may hold him and hand him over to justice if he offend in any way. And if any such one escape, his sureties shall see to it that, without making difficulties, they pay what is charged against him, and that they clear themselves of having known of any fraud in the matter of his escape. ”
