Morgoth, the Dark Enemy of the World.

Great might was given to him by Ilúvatar, and he was coeval with Manwë. In the powers and knowledge of all the other Valar he had part, but he turned them to evil purposes, and squandered his strength in violence and tyranny. For he coveted Arda and all that was in it, desiring the kingship of Manwë and dominion over the realms of his peers.