Wager of law, also known as "oath of law" or "trial by oath," was a legal practice in medieval England in which a defendant could declare their innocence by swearing under oath and presenting a group of credible witnesses to support their claim. Nowadays, this legal term has become somewhat obsolete, but it still has several synonyms that can be used interchangeably. Some of these synonyms include "trial by oath," "compurgation," "oath-taking," "affirmation," and "assertion." These terms refer to similar legal traditions in which one's innocence is established through an oath or affirmation. While the legal systems have evolved over the years, the concept of affirming one's innocence through oath-taking remains an important part of many legal proceedings.