Romanesque (in England: Norman) was a style of architecture in medieval times, characterised by semi-circular arches. It included elements of Western Roman and Eastern Roman (Byzantine)buildings. In the 12th century it developed into the Gothic style, with more pointed arches. Tournai and Ely cathedrals, below, are examples of Romanesque (Norman). St Francis' Basilica is Gothic. Hagia Sophia , Istanbul, is a typical Byzantine building.