Meracydia/Miqo'te/Azys La speculations (spoilers)

[Eisen-Zorn]

Reminder: Xande was only one ruler of the Allagan Empire. They supposedly were around a long time, so it's quite possible that the Allagans were ruled by more than just Xande. Remember, Xande is referred to in the Crystal Tower story as the greatest ruler of Allag, so it's likely that Xande was just a very well liked and prosperous king.

Still, considering that the Crystal Tower is directly connected to Dalamud which is directly connected to Bahamut, it's likely that Azys Lla was created shortly before Amon cloned Xande or shortly after the Xande Clone took power. That is, assuming that Bahamut's resurrection and imprisonment in Dalamud coincide with the building of the Crystal Tower. It's possible that the Allagans put him in Dalamud long before and decided later to build the Crystal Tower to harness his power.

Either way, it's highly unlikely that Azys Lla was created when the original Xande was alive.