“…In Mesopotamia plant ash glassmaking was rooted in and continued an ancient technology that included the exploitation of distinct raw materials, a specific type of plant ash and its processing, as well as unique colouring and opacifying techniques. The survival of Sasanian glassmaking traditions may be linked to the general adoption and preservation of old Persian administrative structures and fiscal systems, and the continued existence of the old Persian elite as part of the internal power structures (Kennedy 2009;Kennedy 2015). The locally ruled semi-independent principalities in Iran and further east had considerable financial autonomy and may have fostered regional industries, including glassmaking, which resulted in a multitude of mostly high magnesia plant ash glass types.…”