Presumably it is a reference to the church of St. Mary Overie which is actually now the same as Southwark Cathedral which is dedicated to St. Saviour and St. Mary Overie. She was the daughter of John Overs who ran a lucrative business ferrying people accros the Thames in the 10th century..
Very interesting. This explanation does seem likely.
It is - and was - a very famous church although it didn't become a cathedral until 1905. It does have a peal of bells. Pepys visited it and wrote about it..."I walked over the fields to Southwark..., and I spent half an hour in Mary Overy's Church, where are fine monuments of great antiquity, I believe, and has been a fine church." Samuel Pepys - 3 July 1663. Monica To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
