You take the letter and read it - privately of course.
"To the nobles of Xane-Peon and King of Kastoria, the swine-herders and the master pig!
Listen, you bunch of useless oafs! You claim to be regents of the boy, but you dare not raise a blade and march to defend him! All you do is hide in the little palace of yours, enjoying wine and money of Xane-Peon, while the kid is sleeping in his crib, unawares of his regents' uselessness!
And to you, master pig of the east! You claim to be King of Kastoria, yet you're no better than those regents! All you do is drink and eat, patting your belly while your men die away from their home and away from their king, fighting my veterans who are more than eager to cleanse my rightful lands from indolent men like you! Unless you really prefer to cling to fancy curtains of Xanean palace, come forth, grab your mantle and your sword, and lead your soldiers to a fight against me and my troops!
Maybe then I will be able to call you alone a 'man' you believe yourself to be! Otherwise, return to your land and go fondle the tit of your wife, for I think that's all you and your relatives can do well! Better yet, be like your cousin, and go drink some poison! You will do the world a favor!
Matin Zoza, King of Xane-Peon."
You pass the letter to the noblemen gathered in the council room, and soon they're raging out loud. You, in the meanwhile, decide to...
A) Swear that this insult will not go unpunished and that you shall strike Matin down personally!
B) Stay put and turn this into a joke, belitting Matin's crude way of writing in the same time.