 This was part of an originally southern and central European trend from the late 1970s onwards that reassessed the European city which had been decimated by war but also modernist planning principles.Key architect-theorists in this viewpoint were, the rationalist architects from Italy Aldo Rossi and Giorgio Grassi, the Swiss architect Mario Botta, and the German architect Oswald Mathias Ungers, and the more historicist-minded Luxembourg postmodernists Rob Krier and Leon Krier.All of these in different ways were concerned in reviving the idea of typology, that is, precedents in urban form.