Glaurung is the creature J.R.R. Tolkien calls the father of dragons in The Silmarillion.
Glaurung is the first fully developed dragon in Tolkien’s legendarium and is described as the Father of Dragons. He serves Morgoth during the First Age, long before the events of The Hobbit and The Lord of the Rings. Unlike Smaug, Glaurung is primarily a figure of the older histories collected in The Silmarillion.
Glaurung plays a central role in the tragic story of Túrin Turambar. He possesses great cunning and the ability to control or cloud the minds of those who face him. His encounter with Túrin contributes directly to the destruction of Túrin’s family and to the tragedy’s final revelations.
Ancalagon the Black is a different First Age dragon and is described as the greatest of the winged dragons. Smaug belongs to the Third Age, while Scatha is a later dragon associated with the Grey Mountains. These dragons are distinct figures despite their shared connection to Tolkien’s mythology.