Mar Ruois was one of the great cities of the Age of Legends, a metropolis created out of technology and the One Power.[1]
At some point during the War of Power, the city was take by the Shadow. It was later retaken by the forces of the Light. Rand remembers the scene through the eyes of Lews Therin Telamon. Great, towering bonfires had been erected at every street crossing during it's occupation and those who refused to swear to the Shadow were thrown alive to the flames. Rand is reminded of it after seeing what the Aiel had done in Taien. [2]
Any trace of the city's existence disappeared during the Breaking of the World.