Question: Is it true that the Postclassical Era is relative to eastern Mesopotamia?
Paraphrase: Postclassical Era is related to the eastern Mesopotamia correct?
SPARQL (Wikidata): ASK WHERE { wd:Q11767 wdt:P654 wd:Q7234117 . wd:Q11767 wdt:P654 wd:Q684 }