St Mary Bothaw is a church that was lost in the Great Fire of London and not rebuilt. It stood at the current site of Cannon Street Station – which was called Candlewick Street back then. The name “Bothaw” is reckoned to be derived from “Boat Haw” or Boat House as it would have been only a short distance from the original banks of the River Thames. However if you look on the Agas map below you will see it is spelt St Mary Butolph. This might just be a misspelling – a confusion with St Botolph Billingsgate which was only 400 years away. On that map you can also see St Swithin London Stone (marked with an ‘S’) on the other side of the road which absorbed the parish of St Mary Bothaw after the fire.
The Copperplate map – contemporaneous with the Agas map – gives a better idea of what this lost church looked like.
Even though the church is lost there are plenty of things that remind us of its presence. First there is the blue plaque just inside the entrance of Cannon Street Station shown below. Then there are two parish boundary markers on the other side of the station entrance above the M&S Simply Food store. These show the dividing line between the parishes of St Mary Bothaw and St Swithin London Stone. Lastly there are three parish boundary markers set into the columns of the Walbrook building on the other side of the road.
The wikipedia page for St Mary Bothaw