The oldest survivor icon panel known of Christ Pantocrator, encaustic on panel (Saint Catherine's Monastery, Mount Sinai). The two different facial expressions on either side may emphasize Christ's two natures as fully God and fully human.
John the Evangelist (Writer of a Gospel) laid his head upon Jesus' Chest at the Last Supper. John is my dear friend. I call him the Saint of love. Author of the Gospel of John (New Testament) and one of Jesus' 12 Apostles.