Grenn and Mac.
Mance: One of our giants went into your tunnel and never came out again. Mag the Mighty.
Jon: He's dead. He killed my friend Grenn.
Mance: He was their king. Last of a bloodline that stretches back before the first men.
Jon: Grenn came from a farm.
Mance: Mac and Grenn.
Jon: Grenn and Mac.