2K has recently announced that Tamar will lead Georgia in Civilization VI: Rise and Fall. Tamar was proclaimed heir and co-ruler by her father, King George III, shortly after a minor rebellion broke out when she was seventeen and assumed the throne of the fractured country when her father died in 1184.
Her unique unit is the Khevsureti who dressed in chainmail and carried swords, axes, and small black bucklers that practically made them invisible during nighttime raids. The Khevsureti get a Combat Strength bonus, but also suffer no movement penalties on hilly terrain. Tamar's unique structure is the tsihke which features high curtain walls with either rounded or triangular "merlons" (the solid part of the "cut out" on the wall used in defensive structures). These fortresses were difficult to assault due to their position on the high ground, so in the game it raises the strength of your outer defenses to the highest level at a lower production cost than Renaissance Walls.
Her unique leader ability is "Glory of the World, Kingdom, and Faith". After gaining the Theology Civic, Tamar can declare a Protectorate War, and with Tamar's upbringing and how she could inspire her troops before battle, her troops gain bonus Faith for a limited time after declaring a Protectorate War. In addition, Georgia gains bonuses as they continue to deliver the word of God. Finally is her unique Civ Ability: Strength in Unity. When making a Dedication at the beginning of a Golden Age, you'll receive its Normal Age bonus towards improving Era Score in addition to its Golden Age bonus.