In recent years, at least 4 sites (Bandian, Mele Hairam now outside Iran's borders, Bazeh Hur, Shilgan) have been excavated which give us a much better idea of this art form in eastern Iran, including Khorasan
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1) Mele Hairam: a number of important late Parthian-Sasanian finds. Likely a fire temple
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This piece is amazing
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I'm still waiting on more publications from this site
but see publications by Barbara Kaim, e.g., Victorious fire at Mele Hairam, in: Historical and Cultural sites of Turkmenistan
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2) Bandian: I've talked about this major site before and here will only provide a few examples of stuccos
There are also MP inscriptions at this site which have been published
The main paper to refer to for comparisons of all 4 sites is "Sasanian Stuccos of Northeastern Iran"
by Labbaf-Khaniki, 2021.
More from Bandian
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Other examples
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3-4) Bazeh Hur, Shilgan (and their comparison to the other sites)
First these pieces @ museum of Khorasan. I'm not sure what site they're from
Please forgive me, but I'm getting excited here... I may have connected some dots that were left unconnected before...
1: In "Ardashir and the Sasanians' Rise to Power" by Dr. @tourajdaryaee & "ReOrienting the Sasanians" by Dr. @sasanianshah I did not see these connections.
2: For some reason various sources note the name of a "Indo-Parthian" ruler as "Sasan", for example ...
in "Problems of Chronology in Gandhāran Art":
and "The interrelation between Indo-Parthian and Kushan chronology", 1992. This second article seems to provide some clues:
Achaemenid Royal Audience Scene, inside shield of Persian soldier on so-called 'Alexander Sarcophagus'
4th C BCE, from Sidon, @ Istanbul Archaeology Museums, Photos: Fluorescent UV & Reconstruction
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An older drawing without some of the details (1);
There are parallels, precedents to #Achaemenid royal scenes in Assyrian, Elamite, other Near Eastern art. Drawing in photo 2 for example is likely of an older, Elamite seal which continued to be used in Achaemenid court
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We see examples of this royal audience scene @ Persepolis, here reconstructed from the fuller image @ Apadana, and another modern recreation @ Zinat al-Molk House