Bahamut

Known as the King of Dragons this Platinum Dragon, was progeny and formerly the mate of Tiamat .
To the draconic cults Bahamut is known as The Betrayer. A figure blamed for the fall of the draconic cults and the sorcerer kings who once ruled over The West. 
To the faith of the three, Bahamut is a saint and guide. Through the creation of the dragonpact with Caim the First Emperor the two were able to carve out a new destiny for the heartland that would become the foundation to the Empire of Runestone.