Kakaisaran Sasanian ragrag kusabab kombinasi runtuhna internal sareng tekanan éksternal. Faktor internal sapertos kapamimpinan lemah, runtuhna ékonomi, sareng instabilitas politik ngaleungitkeun kakaisaran, ngajantenkeun rentan kana invasi. Tekanan éksternal sumping dina bentuk penaklukan Arab-Muslim Iran dina abad ka-7.
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