An emissary from Dulgabêth has come to treat with Gondor.
'He has come to the Black Gate under a flag of peace, and he desires to speak to the king of Gondor. I do not think that is wise.
'I ask that you speak with this emissary on Aragorn's behalf, ${PLAYER}. Remember that he is not to be harmed, and it would be imprudent to be rude. But learn what he wants, and then present his requests to Aragorn.'
Yadêphal is at the Black Gate, waiting to bring Aragorn to treat with his master.
Aragorn is waiting at the Black Gate to hear the terms of Dulgabêth's peace.