I am having difficulty locating an incident of hagiographic iconoclasm:  Two heretic clerics (Lollards?) in the fifteenth (I think) century destroyed an icon/statue of Katherine of Alexandria and defended their action by citing the saint's own iconoclastic destruction of idols in her vita. 

I would be grateful if someone could tell me what I'm remembering and where I might find the source. 

Best,

Gina