A person criticized by John in 3 John.
3 John 1:9I wrote to the church, but Diotrephes, who loves to be first among them, does not receive us.3 John 1:10Therefore, if I come, I will call to mind his deeds which he does, unjustly accusing us with malicious words; and not content with this, he himself does not receive the brethren, and forbids those who desire to do so, and casts them out of the church.