Built in the 15C on a 13C crypt, it escaped the Great Fire but nevertheless suffered in the bombings of 1941 and was restored in 1953. The Church takes its name from a Norwegian Saint, Olaf (995 -1030), a martyr king who fought the Danes at the battle of London Bridge. The white limestone walls show off to best advantage the Gothic stone arches and the 16C to 18C funeral monuments. The crypt is a remnant of the 13C Church.