Little is known for certain about dragons, but much is said in legends. There is no doubt that they do exist and were very much in evidence in the early days of the First Age and somewhat less in the later days of the First Age.

These are some of the legends about dragons:

Krellin and the Dragon

Grivenek and the Dragon

Kaleb's Dragon Stories

The Lore of Dragons According to Zoloas 

Karleg's Dragon Tale

The dragon is also the symbol of a religion called the Order of the Trinity.