High Quality Content by WIKIPEDIA articles! About|Romanesque architecture, primarily English|other buildings in Normandy|Architecture of Normandy. File:Durham Cathedral. Nave by James Valentine c.1890.jpg|thumb|200px|The nave of Durham Cathedral demonstrates the characteristic round arched style, though use of shallow pointed arches above the nave is a forerunner of the "Gothic" style.]] The term Norman architecture is used to categorise styles of Romanesque architecture developed by the Normans in the various lands under their dominion or influence in the 11th and 12th centuries. In particular the term is traditionally used for English Romanesque architecture. The Normans introduced large numbers of castles and fortifications including Norman keeps, and at the same time monasteries, abbeys, churches and cathedrals, in a style characterised by the usual Romanesque rounded arches (particularly over windows and doorways) and especially massive proportions compared to other regional variations of the style.