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An iwan (Persian: ''eyvān'', (アラビア語:إيوان) ''Iwan'', also spelled ivan, Turkish: eyvan) is a rectangular hall or space, usually vaulted, walled on three sides, with one end entirely open. The formal gateway to the iwan is called ''pishtaq'', a Persian term for a portal projecting from the facade of a building, usually decorated with calligraphy bands, glazed tilework, and geometric designs.〔(Dictionary of Islamic architecture: Pishtaq ) archnet.org.〕〔(Pishtaq ) ''Britannica.com''.〕 Since the definition allows for some interpretation, the overall forms and characteristics can vary greatly in terms of scale, material, or decoration. Iwans are most commonly associated with Islamic architecture; however, the form was invented much earlier and fully developed in Mesopotamia, around the third century CE during the Parthian period. ==Etymology== The root for this term is Old Persian 'apadana' (see Apadana palace at Persepolis) where king Darius I declares in an inscription, "I Darius,........ had this 'apadana' constructed.." This is a name given to this particular palace in modern literature, although the name simply implies a type of structure—the iwan, not a particular palace. The term in Old Persian stand for "unprotected" (a-pâd-ana), since the design allows for the structure to be open to the elements on one side, whence the term. At Persepolis, however, the 'apadana' takes the form of a veranda, where instead of a vaulted hall, there is a flat roof held up by columns—but still, open to the elements on only one side. A comparable would be found 2000 years later in Isfahan at the Palace of Chehel Sotoun. By the time of the Parthian and the Sasanian dynasties, iwan had emerged as two types of structure: the old columned one, and a newer vaulted structure—both, however, carrying the same native name of apadana/iwan, because both types are "unprotected" (open on one side to the elements). Iwans were a trademark of the Parthian Empire (247 BC–AD 224) and later the Sassanid architecture of Persia ( 224 -651.), later finding their way throughout the Arab and Islamic architecture which started developing in 7th century AD, after the period of Muhammad (c. 570–632).〔(【引用サイトリンク】title=Dictionary of Islamic architecture: Ivvan )〕 This development reached its peak during the Seljuki era, when iwans became a fundamental unit in architecture, and later the Mughal architecture. The form is not confined to any particular function, and is found in buildings for either secular or religious uses, and in both public and residential architecture. Strictly the term ''iwan'' refers to the room, not to the portico or arch with which it is often fronted. The four-centred arch typically opens on to a central courtyard or Sehan. ''Ivan'' is an alternative form of the name, used in Iran, reflecting the Persian pronunciation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Iwan」の詳細全文を読む スポンサード リンク
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