Missing Cosmogonies. The Roman Case?

I am not saying that the Romans, in the course of their history, did not at some time compose works dealing with the origin of the cosmos and of Man: they did, of course - but only after their city had already been in existence for six centuries and its citizens had acquired a great empire. Only at this point did Lucretius write the fifth book of De rerum natura, Vergil the sixth Eclogue, and Ovid the first book of his Metamorphoses. Naturally, in order to have something to speak about, I could have chosen one of these poems. That I have not done so owes to my interest in another aspect of the question: namely, why did the Romans wait so long to compose works of this kind? Why did they not do so earlier? This is the question I will try to answer - in the conviction that in order to understand a culture, sometimes it is as useful to reflect on what is absent from that culture as to study what is actually present in it.