Aha! I have resolved my Hilarion-Lamion-Ion confusion!
Near the end of KoA, in the scene where Attolis ruins his bedroom after receiving news about Nahuseresh, he explicitly orders Cleon and Ion to come help him change while the other attendants clean up the mess. Both Lamion and Hilarion participate in the conversation after the king leaves, which means Ion must be a separate person rather than a nickname for either of them.
(That remains, of course, an incredibly trivial issue, but I like to have things clear. Next I want to see if I can turn the described geography of our three focus countries into any kind of coherent map...)
Near the end of KoA, in the scene where Attolis ruins his bedroom after receiving news about Nahuseresh, he explicitly orders Cleon and Ion to come help him change while the other attendants clean up the mess. Both Lamion and Hilarion participate in the conversation after the king leaves, which means Ion must be a separate person rather than a nickname for either of them.
(That remains, of course, an incredibly trivial issue, but I like to have things clear. Next I want to see if I can turn the described geography of our three focus countries into any kind of coherent map...)