The most important geometric motifs in mosques of the City of Sana'a during centuries 11-12 A. H 17-18 A. D

الملخص EN

Yemen, like other countries of the Islamic world, has seen a big boom for the Arts architectural and decoration evidenced by the remainings that spread in most Yemeni cities dating back to different periods of time, It was assisted by its heritage of civilization, as the old Yemeni artist has own creations in architecture and related Fine Arts as Sculpture, Painting and engraving.

All architectural installations, especially the mosques, in Yemen replete with crowd of stucco, wood and stone decoration, Which is clear evidence of the high skill in the art of decoration, Where these materials were used on a large scale in construction and carpentry works during the Islamic era, on which all sorts of Islamic decoration has been carried out, and geometric decoration comes in the forefront.We will try in this research to review some of the most important geometric decorations carried out on the mosques of centuries (11-12 A.H / 17-18 A.D) in Sana'a, and to know the basic units of its, the kind of materials on which it implemented , the methods of implementation and the first beginnings of its appearance.

Eleven Mosques are the number of targeted mosques, four of which (Bakeereya, Talha, Al- Galaa and Al-Elmi Mosque)were built in the century (11 A.H / 17 A.D), and another seven (Al-Haimi, Noseer, the Dome of the Mehdi Abbas, Taqwaa, Muammar, AL-Radwan Mosque and Faye Mosques) were built in the century (12 A.H / 18 A.D).