Alexander's decision to relocate a large part of the royal family, especially the male members, from Tibias to Zanzan was of course based on long, historical precedents.
A defeated royal family, weakened both in manpower and prestige was a very ripe target to be usurped by a branch family who would be able to rally many of the frustrated nobles around them, promising them a second chance at freedom and liberation.
Alexander wished to remove that firewood far, far before it had even the slightest chance to catch alight.
And such a move would only have the happy additional instance of removing rebellious thoughts from Philips.
After all, even if one wanted to rebel, they needed to have allies first.
Thus Alexander had been very forceful on this front when he was proposing this to the other nobles, absolutely not taking a no for an answer.
"It is a matter of security for the realm!" He had vehemently posed.