Excerpts from Witnesses to the Book of Mormon as Anglo-Saxon Oath-Helpers by J. Max Wilson:
... I recognized an interesting parallel to the early Norse and Anglo-Saxon origins of English Common Law ... the medieval legal traditions of the Norse and Germanic cultures [is] from [out of] which English Common law, and subsequently American law, developed. As a result, a number people have at least a cursory familiarity with the Athenian forum while far fewer are familiar with the Norse Thing or the Anglo-Saxon Folkmoot, or the later British Witenagemot.
The Anglo-Saxon folkmoot, like the Norse Thing, was a governing assembly consisting of the free members of the community or district. The folkmoot protected the people against anarchy and tribal feuding by mediating disputes and grievances according to the Common Law (Old English folcriht, literally “right of the people”) and in theory provided each free man a single vote ... The Folkmoot and Thing are the early precursors to our modern legislative assemblies and trials by jury. Later, the folkmoots developed into hundred courts, borough courts, and shire courts.
Lawsuits were heard before the folkmoot. The procedure was for a number of “oath-helpers” to testify of the innocence of the defendant, who himself made an oath of innocence. The word “Juror” comes from the Latin iurature, which means “swearer” or “oath maker.” The defendant had to secure a certain number of oath-helpers to establish his innocence . The number of oath-helpers was traditionally twelve, a number that has carried through to our modern juries. If he failed to secure enough oath-helpers, the defendant was judged guilty.
... As the translation of the Book of Mormon neared completion, however, he was permitted to show the plates to a few individuals who are known as the three witnesses and the eight witnesses. It occurred to me that the testimony of Joseph Smith plus those of the three witnesses and then the eight witnesses made a total of twelve testimonies to the real existence of the plates. In a sense Joseph plus the other eleven witnesses filled the ancient role of the twelve Anglo-Saxon oath-helpers needed to establish the fact of their existence. In this way the witnesses of the Book of Mormon fit into a deep rooted cultural tradition that still wields power in our society.
(Unrelated trivia for The Lord of the Rings and Harry Potter fans: The Entmoot attended by Merry and Pippin with Treebeard in “The Two Towers” is based on the Anglo-Saxon Folkmoot; the Wizengamot, or high court of wizards of which Albus Dumbledore is the head in the Harry Potter books, is based upon the Anglo-Saxon Witenagemot—Old English witan means “wise man”)