Diotrephes is a man mentioned in John’s third epistle and condemned by the apostle. His name means nourished by Jupiter.
He desiring preeminence refused to see the letter sent by John, thereby declining to submit to his directions or acknowledge his authority. He circulated malicious slanders about the apostle and exercised an arbitrary and pernicious influence in the Church (3 John 9, 10). A.G.H.
Unger, Merrill F., Unger’s Bible Dictionary, Chicago, Moody Press, 1966, p. 263