Progenitor

The Progenitors presumably preceded the current rulers of Cybertron.

Fiction

2005 IDW continuity

When Rung tried to apologize for spilling a cadet's drink, said cadet snidely asked if Rung was "the last of the Progenitors." Chaos Theory Part 1 Orion Pax addressed the Senate as "descendants of the Progenitors". Chaos Theory Part 2

First Aid lamented never having saved the life of a Progenitor, placing them on par with "a Prime or a Prowl". Life After the Big Bang

Notes

• It is unclear if "Progenitor" is in fact an alternative term for the Guiding Hand, the Knights of Cybertron, the Thirteen, or a unique group as the term is used only once in "Chaos Theory" and never mentioned again.