The Buwaihids were replaced as rulers by the Seljuks who ruled until 1154 when the long-dormant Abbasid caliphs were able to reassert their power over much of Iraq.
In Germany they assume larger proportions and constitute small gables with two or three storeys of windows. The term "dormer" arose from the windows being those of sleeping-rooms. In the phrase "dormer beam" or "dormant beam," meaning a tie-beam, ...
 See also: Principal, Architecture
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