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Nero introduced the dome into Roman palace architecture in the 1st century and such rooms served as state banqueting halls, audience rooms, or throne rooms. The Pantheon's dome, the largest and most famous example, was built of concrete in the 2nd century and may have served as an audience hall for Hadrian.
Most examples of this architectural style and many of the other older Byzantine styles only survive on the outskirts of the Byzantine world, as most significant and ancient churches and buildings were in Asia Minor. During World War I, almost all churches that ended up within the Turkish borders were destroyed or converted into mosques.
The hemispherical dome is a surface formed by the rotation around a vertical axis of a semicircle. Like other "rotational domes" formed by the rotation of a curve around a vertical axis, hemispherical domes have circular bases and horizontal sections and are a type of "circular dome" for that reason.
Typical early Christian Byzantine apse with a hemispherical semi-dome in the Basilica of Sant'Apollinare in Classe Typical floor plan of a cathedral, with the apse shaded. In architecture, an apse (pl.: apses; from Latin absis, 'arch, vault'; from Ancient Greek ἀψίς, apsis, 'arch'; sometimes written apsis; pl.: apsides) is a semicircular recess covered with a hemispherical vault or semi ...
[5] [13] The 10th-century dome is the oldest example of circular dome found in the region of Epirus, probably an evolution of the older octagonal style. [14] The fishbone pattern of the exterior is also found in a number of contemporary church buildings in Epirus, western Macedonia and Lakonia , in Greece, although not a quite common feature in ...
An oculus (from Latin oculus 'eye'; pl.: oculi) is a circular opening in the center of a dome or in a wall. Originating in classical architecture, it is a feature of Byzantine and Neoclassical architecture. A horizontal oculus in the center of a dome is also called opaion (from Ancient Greek ὀπαῖον '(smoke) hole'; pl.: opaia).
The dome of San Sisto in Piacenza (1499–1514) is circular and also includes pendentives with circular medallions. [261] Another early example is Giuliano da Sangallo 's 1485 design of a dome on the church of Santa Maria delle Carceri in Prato .
Early Christian and Byzantine – A projecting semi-circular apse. Romanesque – A rounded end. It may be a lower apse projecting from a higher square end, usual in Italy, Germany and Eastern Europe. In France and England the chancel terminated in a high eastern end of semi-circular form, surrounded by an ambulatory.