<Tr> <Th> Designated </Th> <Td> 24 February 1958 </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 1217661 </Td> </Tr> <P> St Martin - in - the - Fields is an English Anglican church at the north - east corner of Trafalgar Square in the City of Westminster, London . It is dedicated to Saint Martin of Tours . There has been a church on the site since the medieval period . The present building was constructed in a Neoclassical design by James Gibbs in 1722--1726 . </P> <P> Excavations at the site in 2006 led to the discovery of a grave from about 410 AD . The site is outside the city limits of Roman London (as was the usual Roman practice for burials) but is particularly interesting for being so far outside, and this is leading to a reappraisal of Westminster's importance at that time . The burial is thought by some to mark a Christian centre of that time (possibly reusing the site or building of a pagan temple). </P>

Scottish architect who developed st martins in the field