The Parsian envoy is let in first.
"Greetings, King Cyl of Methiant! I am Babab Hahalol, and I bring an offer from my glorious master, King Shapur! In his magnificent studies of old maps and ancient tomes of knowledge, he has found out that the lands in the very south of Ceodwell are rightfully Parsian." The courtiers grumble and murmur aloud but the envoy doesn't stop speaking.
"Therefore, my lord and master, King Shapur, in his magnanimity, offers a trade and a marriage deal to perhaps convince you! He understands that the main point of resistance to his offer would be the highly profitable gold mines. Therefore, for next twenty years, half of the profits from these excellent mines would be sent to your coffers, before the ownership would fully fall into Parsian hands."
"In exchange, King Shapur is ready to give away the settlements and glassworks located at the border, near the Minirok Mountains, the southern of mountain ranges in Parsian west, as well as give away the hand of his eldest daughter to one of your many prince-sons, as he has learned most of them are adult or almost adult and would soon be looking for a viable bride." The trade-off is evident even without your trade advisor chiming in; gold mines produce direct profits, while quality glasswork requires finding a buyer - on other hand, access to such luxuries could strengthen people's belief in the dynasty, plus family ties with Parsia could also be beneficial in a long run...
A) That is a fine offer, and I agree!
B) How about something little extra on top?
C) These lands are rightfully ours and I won't sell them!