E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Overy.
St. Mary Overy (Southwark). John Overie was a ferryman, who used to ferry passengers from Southwark to the City, and accumulated a hoard of wealth by penurious savings. His daughter Mary, at his decease, became a nun, and founded the church of St. Mary Overy on the site of her fathers house.