The Primes

In Transformers: Revenge of the Fallen, the original thirteen were the 'Dynasty of Primes', scattered throughout the galaxy looking for planets where they could build Sun Harvesters. These Sun Harvesters, powered by the Matrix of Leadership, were capable of harvesting a sun's energy to produce Energon. The Dynasty of Primes had one rule: Sun Harvesters were not to be built on worlds containing life. The Fallen, ignoring this rule, arrived on Earth 17,000 BC and started building a new Sun Harvester with other Cybertronians. This resulted in the war between the Autobots and Decepticons, with the Fallen defeated by the Dynasty of Primes as they sacrificed themselves to seal the Matrix. When Sam temporarily dies, he sees a vision of the Dynasty and they tell him he has earned the Matrix and this was always his destiny. The Dynasty then resurrects Sam, who brings back Optimus. Optimus then kills the Fallen, the last remaning origninal Transformer.