Dragon Age - The Wandering Blades
Orzammar is a thaig and one of the remaining dwarven kingdoms in Thedas. An underground metropolis, the thaig is located deep beneath the Frostback Mountains. According to legend, the thaig’s name derives from one of the seven brothers who founded the dwarven empire and his descendants formed the miner caste.
According to the dwarven history, the dwarven empire once spread across all of Thedas, and that the underground city-fortresses called thaigs were almost beyond counting. Kal-Sharok was the capital then, home to all the noble houses, and Orzammar was simply the home of the miner and smith castes.
Orzammar and its sister-cities of Kal-Sharok and Kal’Hirol, are considered “great thaigs”, as opposed to the numerous other thaigs as they were once the main centers of the dwarven empire.