A large variety of arch forms were used including round, two-, three-, and four-centre arches, although the most common was the three-centred arch with a high crown, where the height of the arch was more than half the height of the entire opening.
About the middle of the 14th century at Gloucester the fourcentred pointed arch was introduced, which became afterwards the leading characteristic feature of the Tudor style. In France they adopted the three-centred arch in the 15th century.
A semicircular window with two mullions; also called a Diocletian window after its use in the Baths of Diocletian, Rome.Tholsel(Irish): An exchange or market house; the English term is tolsey.Three-centred arch ...
 See also: Brick, Architecture, Mosaic, Arches, Timber
  
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