And entering into the sepulcher, they saw a young man sitting on the right side, clothed in a long white garment; and they were amazed.
All Commentaries on Mark 16:5 Go To Mark 16
Gregory The Dialogist
AD 604
And let us also take note of what it means that the angel is seen sitting on the right side. For what does the left side mean but this present life; and the right hand side, if not life eternal? … And so, since our redeemer has now passed over beyond the mortality of this present life, rightly does the angel, who had come to announce his entry into eternal life, sit at the right side. And he came clothed in white: for he was announcing the joy of this our present solemnity.