Hime Kishi wa Barbaroi no Yome - Vol. 2 Ch. 8 - Sword dance is a sign of intimacy

[MangaDex]

 

[GrumpyGizmo]

The 16th expedition. So perhaps HIS mother is actually that throne heiress that was kidnapped by his father? It would mean he is the heir of the kingdom (assuming she didn't have more brothers or sisters which I doubt). That has to be the case, why else was this info leaked in this chapter right here?

But if that's the case why would a princess from the kingdom be allowed to fight those dangerous fights?