Jorah Mormont is an exiled knight who serves Daenerys Targaryen. He was originally sent to spy on the Targaryens for Lord Varys, but falls in love with Daenerys, and he protects and helps her.
Tyrion: You're going the wrong way. My sister's in Westeros. Westeros is west, we're heading east.
Jorah: I'm not taking you to your sister.
Tyrion: You said you were taking me to the queen.
Jorah: I am, to Daenerys Targaryen. She's the queen I serve.
Tyrion: [laughs] What a waste of a good kidnapping. So happens, I was heading there myself.
Daenerys: Get him out of my sight.
Jorah: Khaleesi please, I just need a moment of your time. I brought you a gift.
Tyrion: It's true, he has.
Daenerys: Who are you?
Tyrion: I am the gift. It's a pleasure to meet you, your grace. My name is Tyrion Lannister.