 This may have been a factor in the decline of Barḏa in the second half of the tenth century, along with the raids and oppressions from the rulers of the neighboring regions, when the town lost ground to Beylaqan.Centuries of earthquakes and, finally, the Mongol invasions destroyed much of the town's landmarks, with the exception of the fourteenth century tomb of Ahmad Zocheybana, built by architect Ahmad ibn Ayyub Nakhchivani.The mausoleum is a cylindrical brick tower, decorated with turquoise tiles.