so uh... why is a prince allowed to publicly and loudly be a nuissance trying to woo a married women who clearly have told him off... like the royal family is allowing this walking breathing red flag go around in public at an event do this to a famous war hero's family with no reprecussions? civil wars and duels have started for less in history. Just cause they are royalty doesn't mean they can do whatever they want like bro wtf
and honestly Zach might as well act on that 'request'
Depending on the location and the point in history, that sort of shit is
exactly what royalty could get up to . . . if they had the political backing. The idea that laws can restrict the power of an absolute monarch (or someone who's got the full support of that absolute monarch, like an heir) is surprisingly recent; social norms, particularly the social norms upheld by the kingdom's more powerful aristocracy, have always been the bigger constraint on the behaviour of absolute monarchs. Along with religions, of course.
The ultimate constraint on an absolute monarch is someone else who can claim to be an absolute monarch, and convince enough people to back them up in that claim - which is why most political skulduggery in that kind of context is about who backs which of the royal heirs, and what kind of support they can bring. Bianca's father is a supporter of the first prince; he married her off to Zachary to bring him into the first prince's circle. Zachary the hero is a significant support for the first prince, but so is the military power of Arno; he also seems to have a mystique of sorts, too, not just about being incredibly powerful but also righteous, which probably stems from him being so straight forward and blunt.
On the other hand, fuckface second prince doesn't have a whole lot of good solid backing, and his behaviour seems to be burning through that backing reasonably quickly. If Zachary had drawn his sword and beheaded the prince then and there it would probably have worked out really nicely for just about everyone . . . except the more hardcore supporters of the prince, but they would have just lost their claimant to the throne, and they lose almost all their relevance as soon as that head rolls on the grass. But Zachary's own personal power, the fact that he was acting in defence of his wife, and the fact that he's close to the inner circle of the first prince would mean he could probably get away with it in the heat of the moment.
Doing that sort of thing in cold blood is a different matter, though, so I'm curious to see how Bianca's planning to kill off fuckface mcprince . . .