Delzoun was the great Northkingdom of the dwarves from -3900 DR to -100 DR.
The kingdom extended from the
Ice Mountains south to the Rauvin and Nether Mountains at its height.
Much of the Delzoun wealth was gained by trading with the
Netherese. They notably created the Fardrimm, a series of underground roads spanning the breadth of their empire and beyond into other areas of the North. The most famous of these underground roads was the Lowroad, which linked the Delzoun lands with Netheril.
The name survives as a middle name among modern day dwarves, one of much prestige.
The dwarves completed construction of
Citadel Felbarr in -1900 DR.
Illuskan Maerin Immar commissioned a number of Delzoun artisans, including Fardelver, to construct Gauntlgrym in -335 DR.
 Citadel Sundbarr and Ascalhorn accepted human refugees from the recently fallen Netheril in -333 DR. In the same year, the dwarves begin to slowly abandon Ascore.
Year of Terrible Anger, -111 DR, the Delzoun fell prey to the same orc assaults that devastate other kingdoms of the North.
In -100 DR, Delzoun fell to the
phaerimms and other dangers. Surface settlements including Citadel Adbar, Citadel Felbarr, Mithral Hall, and Sundabar survived the fall but the underground settlements did not.
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Richard Baker, Ed Bonny, Travis Stout (February 2005). . ( Lost Empires of Faerûn Wizards of the Coast), pp. 84–89. ISBN 0-7869-3654-1. ↑ R.A. Salvatore (2007).
The Hunter's Blades Trilogy Collectors Edition. (Wizards of the Coast), p. 207. ISBN 9780786943159.