Quote:In Ultimates2 #6, Al Ewing gives us the origin of the First Firmament and as such, gives us the earliest events in the Marvel Universe, that is, 8 universes/multiverses ago. The First Firmament is the abstract entity representing the very first universe. The first living things worshipped the First Firmament and were called Aspirants. Among the Aspirants were the first Celestials, who rebelled and ultimately defeated the Aspirants and the First Firmament, who was shattered into pieces, but it survived and fled into the void. The Celestials then created the first multiverse, which has died and been reborn several times since. During the death of the seventh iteration and its rebirth, the First Firmament took advantage of the multiverse Eternity being in a weakened state and chained it. It then corrupted Master Order leading to the creation of Logos.
The first multiverse was born from the new universes that sprung forth after the First Firmament fractured during the war between the Aspirants and the Celestials. The Celestials just populated the first multiverse