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The early history of Tabriz is not well-documented. The earliest civilization signs in the city belong to an Iron Age graveyard of 1st millennium B.C. which were unearthed in the late 1990s on the northern side of Blue Mosque. The city also inscribed as old as 714 B.C. as Tarui or Tauris, on the Assyrian King Sargon II's epigraph in 714 BC.