As you can see from the title this is St Seiriol's Well, I don't think that we can possibly say that this dates back to the 6th century nevertheless it was thought to have healing powers and was visited by the sick and infirm. In 1811 the well was recorded as 'formerly in good repute' - does this mean that at that time it was no longer deemed so?
There are many wells such as this all over Wales and whether they have any potent powers or not can only be a matter of 'whatever floats your boat.' Judging by the coins glistening under the water it is quite clear that some believe that it can make wishes come true.
We can however say that St Seirio's well now!