Sien (ca 1120 BC-1100 BC) was a king of the ancient Caucasian kingdom of Diaokhi known as Daiaeni to the Assyrians.

In 1112 BC , he led a large coalition of the rulers of Nairi to counter the Assyrian offensive to the north. The Assyrian King Tiglath-Pileser I routed the allies. Sien was captured and later released on terms of vassalage.

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სიენი (in Georgian)