Relating to or derived from the ancient kingdom of Grus or Iberia (modern-day Georgia), or relating to Georgian culture in the historical sense.
From Grus, the Latin name for ancient Iberia/Georgia, plus the adjectival suffix -ian. Related to Grusinian, describing the region and people historically.
The region was called different names by different empires—Greeks called it Colchis, Romans called it Grus/Iberia, but the people have always called themselves Georgian or Sakartvelo, showing how outside labels often don't match self-identification.
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