For 10 points, name this city, built as Timur's capital and now in Uzbekistan.
This city's Shah-i-Zinda tomb complex is the permanent home of Shirin Beg Aga.  The monumental gate of the Aq Saray palace is near this city. Elephants were used to bring in marble for the courtyard of a building with an enormous Koran stand, the Bibil Khanum mosque. Many buildings in this city have strongly ribbed domes on very high tiled circular drums. The central square of this city, which has the (*) Ulugh Beg madrasa, is the Registan square.  Clavjio visited this city, and Nader Shah tried to steal a jade slab from this city's most famous building; that building was excavated by Gerasimov and is the Gur-i-Amir. ► For 10 points, name this city, built as Timur's capital and now in Uzbekistan.
This city's Shah-i-Zinda tomb complex is the permanent home of Shirin Beg Aga.  
Samarqand (or Samarkand)