To serve the Motherland all one's life and stand guard over its interests. To fight and die for its glory and that of one's people. Every knight is always ready for this. This is what the concept of knightly honor and duty demands.
He was unlucky. Oath and duty obliged him to serve his kingdom where the notion of honor means practically nothing, and military valor is hardly needed. To be more cunning, more resourceful, more treacherous than the enemies of the kingdom — that is what is required of him. To become like a watchdog at the royal house of Nesvizh. But he is ready to pay this price, because first in his heart always was and will remain Nesvizh, his homeland, his home, his fate.