War of the Primes (Earth-1984)

The War of the Primes (historically called the First Cybertronian Civil War) is a civil war fought between the Thirteen toward the end of the Age of the Primes.

Origin
The war started when Megatronus and Liege Maximo joined forces to betray Solus Prime, which escalated into open warfare between the combined forces of the Primes and their beraying brethren.