in Cyberverse, the personalities of the 13 are in the matrix, which implies each of them wielded it, which made me think what if the 13 weren't contemporary to each other?
Prima had the matrix, making him Prime and he ruled for awhile before dying and passing it on to Vector Prime, who did likewise, and so on and so forth until it fell into Megatronus' hands, and his betrayal was to not pass the matrix on, believing noone else was worthy, leading to the Matrix being lost for at time, Legends about it being found by the legendary thirteenth prime abound, until it is finally found by the future Nova Prime, starting a new dynasty of Primes eventually leading to Optimus and even Rodimus.