Forgotten Plains
From Transformers Wiki
The Forgotten Plains are an ancient settlement located on Cybertron in the distant past. They were overseen by Liege Maximo before Megatronus conquered them.
Fiction
2005 IDW continuity
After the Knights of Cybertron left the planet, Liege Maximo came to be the monarch of the region. After Megatronus decided to conquer Cybertron, his army of Darklanders conquered the Forgotten Plains prompting Maximo to flee. After meeting Onyx Prime and being introduced to the council of the Primes at Crystal City, Liege introduced himself as the monarch of the Forgotten Plains. Solus Prime wasn't particularly impressed. Origin Myths