Primon

Primon is presumably an Autobot in Generation 1 continuity.

Primon held the Autobot Matrix. It was ripped from his chest by the Leige Maximo. Nothing else is known about him or his fate.

Fiction

Tales of the Beast Wars

Reaching the Omega Point

Primon appears only in the 3H Reaching the Omega Point text story, in a vision of another time, viewed by the Covenant of Primus and the Chronarchitect.

(Primon is conspiciously absent from other lists of past Primes, even those by Simon Furman who wrote this text story.)

From Teletraan I: The Transformers Wiki, a Wikia wiki.