Alduin is the first born of the Dragon God of Time, and is the Nordic god of destruction. Strongest of the dragons. The Nords believe that his appearance means that time will end.He represents the Nordic culture in the game Skyrim.

The Dragon War

When the Humans fought the dragons in the Dragon War the dragon god Akatosh commanded Alduin's Luitenant Paarthunax to teach the humans the way of the voice (dragon tounge where they shout creatures/people to death). Using the way of the voice and the Elder Scroll,a majical scroll with immense power over time, Ancient Nord Heros banished Alduin into time, but they actually sent him 1000 years into the future where the last Dragonborn killed him.