{There is no plaque explaining the configuration of cobbles in the pavement..}
These cobbles mark out the site of the original circular church of the medieval priory of the Order of St John of Jerusalem.
Site: Priory of the Order of St John of Jerusalem (1 memorial)
EC1, St John's Square
The Priory once occupied a ten-acre site including this church and St John's Gate. The church was rebuilt following WW2 bombing.