GlaurungGlaurung - The first of the great dragons of Middle-earth.  As such he is often referred to as the "Father of Dragons".  He was also known as "The Great Worm" as he was a wingless serpent.  Bred by Morgoth within the walls of Angband, he would cause devastation for centuries.

 

"...Glaurung, the first of the Urulóki, the fire-drakes of the North, issued from Angband's gates by night.  He was yet young and scarce half-grown, for long and slow is the life of the dragons, but the Elves fled before him to Ered Wethrin and Dorthonion in dismay; and he defiled the fields of Ard-galen.  Then Fingon prince of Hithlum rode against him with archers on horseback, and hemmed him round with a ring of swift riders; and Glaurung could not endure their darts, being not yet come to his full armoury, and he fled back to Angband, and came not forth again for many years.  Fingon won great praise, and the Noldor rejoiced, for few foresaw the full meaning and threat of this new thing." ~The Silmarillion, chap. 13 (Of the Return of the Noldor)