So, the annulment. I wonder what the grounds could have been. Obviously, we don't know Westerosi law, but annulment normally erases a marriage entirely due to some legal or cultural problem (e.g. bigamy, fraud, forced consent, failure to conceive or lack of consommation).
Sansa/Tyrion never fucked so annulment was justified. The show and books strongly support the consommation requirement.
But Rhaegar had two kids already and his wife is a legit Dornish princess. So was there a reason or are they just saying annulment because it sounds more medieval than divorce?