Some of Drogo's lines in the House of the Undying are similar to lines from Conan the Barbarian, another character portrayed by Jason Mamoa;
Drogo: Or maybe this is a dream. Your dream or my dream, I do not know. These are questions for wise men with skinny arms. You are the moon of my life, that is all I know and all I need to know. And if this is a dream, then I will kill the man who tries to wake me.
Conan: Let teachers and priests and philosophers brood over questions of reality and illusion. I know this: if life is an illusion, then I am no less an illusion, and being thus, the illusion is real to me. I live, I burn with life, I love, I slay, and I am content.