Who possesses the authority to admit a person to the Lord’s Supper or to ban the unrepentant sinner from it — the civil magistrates or the officers of Christ’s Church? The debate of this question led to one of the most pivotal showdowns in John Calvin’s ministry; and, in the end, those who adhered to the Scripture prevailed. For a thorough treatment of this important episode by Marcus Serven — one of our featured Reformation 500 speakers — click here.