i normally don't really ask things on here (though i'm a longtime fan!) but something is puzzling me. the wiki lists daena's marriage to baelor as 160 AC, and Daeron's death as 161 AC. i know daeron returned to Dorne in 160AC, but what is the logic of marrying daena to baelor? surely as the oldest sister she was expected to marry daeron first and foremost? do you think daeron himself arranged this, or viserys for some reason in particular? or is this GRRM messing up his own worldbuilding so he can justify their annulment later on?
Alas, you're not the only one puzzled, this is something we don't know. Pre-TWOIAF, GRRM stated that Daeron was married,* but he dropped that plot point when finalizing the Targaryen family tree for that book. (Which is where those dates of 160 and 161 come from for the wiki.) It may be he still thinks Daeron was betrothed* but not yet married (refusing until he'd finished conquering Dorne), or maybe some other thing was happening there. But I doubt it's a worldbuilding issue, there's for sure a reason that fits into the politics of the time, we just don't know what it is yet. It'll be in Fire & Blood volume 2 (or Blood & Fire, whatever it ends up being called), one day.
*Married or betrothed to whom? Well, since it wasn't a relative, I'd suspect a foreign alliance (cf. Daeron's own wish to betroth one of his sisters to the Sealord of Braavos), perhaps arranged when Daeron was young. Something done by Alyn Oakenfist and Hand of the King Viserys, most likely, since Aegon III was so removed from that sort of thing. Maybe Daeron's mother Daenaera was involved! (she said hopefully, and likely fruitlessly.) Could've been to a Lyseni Valyrian family, in an attempt to repair the Rogare problems. (Larra had left Viserys and returned to Lys in 139, but she died in 145, two years after Daeron was born.) Could have been to a Volantis Valyrian family, again related to one of Alyn's voyages. Or maybe someone from even further east! (Yi Ti? she again said hopefully and probably fruitlessly.)
Or maybe it was someone local. We still have no idea how Unwin Peake's villainy was ever resolved, if it was. Also Aegon III apparently made an enemy of Torrhen Manderly by canceling his coming-of-age progress, so maybe someone northern? (Some resolution with Cregan Stark to the Pact of Ice and Fire, one of his daughters with Aly?) Or who knows, maybe there was some attempt at a Dornish alliance during Aegon III's reign (since Alyn was so, um, friendly with Aliandra Martell), and its failure is one of the reasons Daeron was so determined to "complete the Conquest". But any further speculation would be fanfic I don't really care to write, so again, we'll just have to leave the details for the F&B continuation.