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Kashgar is a religious city-state from the Path to Nirvana scenario in Civilization VI. It is the only city-state in the scenario with a unique Suzerainty bonus.
Civilopedia entry
The oasis home of Kashgar's Uyghurs was a hub on the Silk Road, making it a cultural, social, and economic destination for traders throughout the region. The downside was all the pesky would-be conquerors, including Muslim invaders who attempted a series of invasions across three centuries starting in 711 CE.