Quoted By:
From the TFWIKI, a summary of the Legends Fortress Maximus comic.
Fortress looks back on his past as a non-transforming weapons engineer who left Cybertron with his comrades four million years ago, crash-landing on the inhospitable planet Master. As they did their best to survive, they witnessed another starship crash nearby: studying unknown technology from the wreckage, Fortress was able to develop Headmasters. He went on to construct the battleship Maximus, which was lost in the blackball incident, so now he's rebuilding it in the form of their company HQ.