There could be more than one wave of ancient colonists to Sainte Anne. Arbitrarily:
Gondwanaland: the Shadow Children (goblins)
Etruscan Italy: the Wetlanders (trolls)
Homeric Greece: the Free People (elves and dryads)
Poictsme: ?
Country of Friends: ?
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A note about the lethal twins and David:
I wonder if David was designed by Maitre to be his own tanist--that is, a twin for Number Five to kill in rivalry instead of killing Maitre in usurpation?
It nearly happens, when the attack on the "mantis" slave goes awry and Number Five's knife goes into David's thigh (with shades of the brother-kill-brother in "A Story"). As Maitre patches David's leg up without comment, he must be realizing that the ploy didn't work.
=mantis=