Earliest depiction of #Simurgh/ Senmurv (سیمرغ) in the world I am aware of: sealing, Excavated @ Bandian (بندیان), 5 C CE (i.e., 401 - 500), possibly reign of Bahram V
Firmly establishing this motif as #Sasanian. Now @ Great Museum of Khorasan (موزه بزرگ خراسان)
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Various seals & other objects were found @ Bandian. As far as I know, this particular one hasn't been fully published.
Some of the other sealings & seals from Bandian
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Some other important Sasanian objects @ Great Museum of Khorasan
Virtual Museum: The Tillya Tepe (Tillā tapa: Golden Hill; طلا تپه) Treasure, northern Afghanistan (Khorasan)
I hope these objects will remain safe. Photo: From March 1990 National Geographic magazine article
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"The hoard is a collection of about 20,600 ornaments, coins & other kinds of artifacts, made of gold, silver, ivory, etc., that were found in six burial mounds erected for five women & one man, with extremely rich jewelry, dated to around 1st C BCE-1st C CE."
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I'm not going to write too much here.
Most images have descriptions. So you can enjoy the treasure and read more if you like
Generally, we see great continuity in various aspects of Nowruz celebrations. We can say it was, like other feasts & major celebrations, about preparing for the feast & with very ancient Indo-Iranian roots
Like other feasts, there was merriment & food, as there is today
Numerous later sources link it to the Indo-Iranian figure/king Jamshid/ Yima
Unfortunately it does not appear that scholars like @sasanianshah have sufficiently considered the origin of Nowruz.
If we require evidence for hypotheses, I have no issue if some evidence
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is provided linking this celebration with Babylonian calendars. Otherwise, it's pure conjecture.
It's true that some ideas could have been borrowed from other nations throughout time, but Nowruz' origins appear to be in Central-northern Asia & predate Iranians' migrations