compurgator

Etymology
From or, from.

Noun

 * 1) Someone who vouches for another person's innocence, trustworthiness etc.
 * 2)  A character witness in canon law who swore an oath that the accused was innocent.
 * 3)  An ‘oath-helper’ in Anglo-Saxon or Germanic law who testified to the character of an accused person.
 * 1)  An ‘oath-helper’ in Anglo-Saxon or Germanic law who testified to the character of an accused person.