Which Italian city was ruled by the Nine and called itself the "Virgin's ancient city"?

Name: Which Italian city was ruled by the Nine and called itself the "Virgin's ancient city"?
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Siena was ruled by a government known as the Nine, and it referred to itself as the "Virgin's ancient city." Florence was not ruled by the Nine, and while both Padua and Venice were connected to trade and maritime power, neither referred to themselves in this way.

Which Italian City Was Ruled by the Nine and Called