This paper outlines the history of preservation in situ as practised in London over the last hundred and fi fty years. It touches upon the early development of the City of London and the destruction of signifi cant remains, which gradually lead to a heightening of sensitivities and public concern for preservation, particularly of built fabric such as the Roman defences. The role of cases such as the Walbrook Mithraeum and Rose Theatre are discussed, both infl uential in changing the relationship between development and archaeology. The paper concludes by noting how much we have learnt from past mistakes, but notes that more can be done to make these sites more accessible.keywords London, archaeology, Roman, Rose Theatre, urban preservation in situ