Sybaris

Sybaris was a Dragon.

Greek mythology
In Greek Mythology, Sybaris was a dragon that terrorized the Greek city of Delphi. When the Oracle was asked how to stop it, it said to sacrifice a young man. Eventually, a Demigod was chosen, and he defeated the dragon.

The Titan's Curse
In The Titan's Curse, Atlas made the Skeletons with her teeth. The mortals thought the teeth were T-Rex teeth.