Iacon is a center for the Autobots in variousTransformers universes.
Iacon was the base where Optimus Prime (Convoy) and his Autobots (Cybertrons) forces lived until they crashlanded on Earth.
Following the end of the Third Cybertronian War and the final defeat of the Decepticons, Iacon (like the rest of old Cybertron's cities) was replaced and built on top of with another city.
Optimus Primal and Nightscream rediscovered Iacon while searching for the sparks Megatron had stolen- Megatron used a holographic "statue" of Optimus Prime to trick Primal into revealing the secrets of the Oracle, while Nightscream battled Thrust and his Cycledrones. The city was also Noble's temporary residence- he left with the Maximals when they returned to the others.
Marvel U.S., Marvel U.K.
Iacon was the greatest of Cybertron's city-states, and the home of Optimus Prime.