Cet'ingira is referred to as a Prince in the first TTT chapter in the Dagliash flashback. Odd though, as he's not an Ishroi, if I remember. Just Quya.
I can't think of any others.
I had forgotten about that! It is somehow strange, since as far as we know Cet'ingira (like SmilerLoki said) is not of the line of Tsonos and therefore has no royal blood. Maybe he had a sobriquet ("Prince of ____", it would be similar to "Lord of ____", which we've seen before in Nonmen) and Men started referring to him as a prince because of that? Or maybe he never had any such title and it was an actual mistake someone made at some point which kept being repeated through the ages? Who knows...
He's referred to as Prince by Seswatha, not by other Nonmen. He is also not of the line of Tsonos, since Nin'ciljiras is considered to be what's left of it. So Cet'ingira is highly unlikely an actual Nonman Prince.
Also, Quya and Ishroi seem to be equal in their standing. For example, Nil'giccas's mother, Tsinirû, was a Quya and at the same time queen of Ishoriol.
Exactly, it was probably a mistake started by someone who wouldn't know if he was of the line of Tsonos or not, or part of some poetic designation, something along those lines. Anyway, I think Cet'ingira is probably the only Nonman to be referred to as a prince (even if not actually one), which is kind of a shame, as I'd like to have an actual answer on this...
They do seem to have roughly equal standing, but, then again, we might not have enough examples to be sure. If I remember correctly, Nil'giccas was actually both Qûya and Ishroi, right? Status of Qûya might also be different if the Nonman in question is a monarch (like Tsinirû and Nil'giccas).
If I had to guess, I'd say it was a quirk of honorifics being abscent, but I'd guess that the line of Tsonos would just be royalty, with the new head being annoited as king, however that's decided.
Kind of a moot point, when there aren't any more children, and the last title given was probably Last Born. Being next-in-line isn't super relevant when the Title holder is immortal lol.
That's what I thought, but it seems odd to me that they'd have the equivalent titles for king and queen but not for other royals. I wonder if they were just referred to as "X, heir to Y" or "X of the line of Tsonos", or something similar.
It's a moot point
now (in-universe), but it wouldn't have been when the characters that got me thinking about this were alive. That's what I was getting at, I wanted to know if the title of prince/princess (or some equivalent) had ever existed in Nonman society.