WI: Diocletian Has a Son?

WI: Diocletian Has a Son?

In OTL Diocletian had a daughter named Valeria who married his co-emperor Galerius. So instead Diocletian has a son, to make it easy we can call him Valerian. How would Diocletian's plans have changed if he had a male heir? Would we see Maximian, Galerius or Constantius supplanted? Who would be likely marriage candidates for Valerian?
 
We could have two different situations: one where Diocletian ignore the presence of his son in order to stabilize the Tetrarchy as an elective monarchy, instead of an hereditary one. Probably you would see "Valerian" serving in the army of Galerius as Constantine did, before his rise as Caesar. In the end I would see him killed along with other relatives of the Tetrachs, like Candidianus, by Licinius or an other ambitious successors.
The second option is Diocletian appointing him Caesar ( I would exclude an outright nomination as Augustus) of Galerius, ruling over the same territory his father controlled. t would be interesting to see Valerian relation with cristians: he could follow the policy of his father and Galerius or join the other tetrarchs and proclaim an amnesty. He could marry Fausta Maximianus' daughter and Constantine's wife.
 
If he appointed him to a position in the tetrarchy, he'd probably have Maximian appoint him as Caesar in the West, since a major factor leading to Diocletian's appointment of Maximian as co-Augustus was that he didn't have too many political ambitions for himself or his family (at least, according to my limited understanding of the period based on a few secondary sources). *If* this were the case, I think a marriage to some family member of Galerius would be a better decision, at least for stability in the longer term (since they would rule together for 20+ years). It's also quite probable that Diocletian would ignore his son in the succession, as his track record shows he didn't seem to favor that sort of nepotism in political appointments anyway. However, if he ignored Valerian in the succession, its very likely that he would be a strong contender with Licinius in the coming civil wars of the tetrarchy. If he wasn't ignored, he would probably slug it out with Maximianus and Constantine until the eventual winner would face Licinius (as happened IOTL)
 
Considering that it was a duty of the Augusti to appoint a Caesar, I think it's more probable to see Galerius appoint Valerian as his Caesar instead of Chlorus given that among all Tetrarchs, Galerius seemed to be the one more devout and loyal to Diocletian and his project.
 
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