Many swords with wavy surfaces were made from this city's namesake steel.
This city's involvement in the silk trade made it the namesake of a kind of woven fabric where the pattern can be seen from both sides. Somehow, an ancient material named for this city includes carbon nanotubes that make it super-strong. In this city, eight Roman columns were used in the Dome of the Treasury, in a Great Mosque decorated with Byzantine mosaics. This city became a capital under (*) Muawiyah. Many swords with wavy surfaces were made from this city's namesake steel. After 750, the capital was moved from this city to Kufa and then to Baghdad under the Abbasids. For 10 points, name this capital of both the Umayyad caliphate and modern Syria.
This city's involvement in the silk trade made it the namesake of a kind of woven fabric where the pattern can be seen from both sides.
Damascus [or Dimashq; or ash-Sham] &lt;JR&gt; Tiebreaker