Al-Walid I
The accusation was, allegedly, made by Byzantine Iconoclast emperor Leo the Isaurian, who was indeed a great opponent of St John, and friend of Al-Walid I. Upon praying in front of an icon of the Theotokos, allegedly, his hand was miraculously restored. In thanksgiving, he had a silver replica of his hand fashioned and attached it to the icon. After this, the icon became known as "three-handed" (Tricherousa), because it had three hands (two of Theotokos plus one more).