At Boxley also was a famous image of St. Rumald, Rumbold, or Grumbald, the son of a Northumbrian king and of a daughter of Penda, King of Mercia. He died when three days old, but not before he had repeated the Lord's Prayer and the Apostles' Creed in Latin, a feat for which he gained canonisation.

His image at Boxley is said to have been small, and of a weight so light that a child could lift it, but that it could at times become so heavy that it could not be moved by persons of great strength.

Thomas Fuller, the quaint old divine, tells us that "the moving hereof was made the conditions of women's chastity. Such who paid the priest well might easily remove it, whilst others might tug at it to no purpose. For this was the contrivance of the cheat — that it was fastened with a pin of wood by an invisible stander behind. Now, when such offered to take it who had been bountiful to the priest before, they bare it away with ease, which was impossible for their hands to remove who had been close-fisted in their confessions. Thus it moved more laughter than devotion, and many chaste virgins and wives went away with blushing faces, leaving (without cause), the suspicion of their wantonness in the eyes of the beholders; whilst others came off with more credit (because with more coin), though with less chastity."