Saint Stephen Walbrook dates from the seventh century and was built on the banks of the River Wa1brook, which is now culverted beneath the road.
The church was destroyed in The Great Fire and rebuilt by Christopher Wren in the 1670s. The dome being based on Wren's original design for Saint Paul's cathedral.
Saint Stephen's was slightly damaged during tTe Blitz and was restored in 1954.
More information can be found on Wikipedia and from Saint Stephen's website.