You are your mother's trueborn son of Lannister."" Am I?" the dwarf replied, sardonic. "Do tell my lord father. My mother died birthing me, and he's never been sure."" I don't even know who my mother was," Jon said. "Some woman, no doubt. Most of them are." He favored Jon with a rueful grin. "Remember this, boy. All dwarfs may be bastards, yet not all bastards need to be dwarfs." And with that he turned and sauntered back into the feast, whistling a tune. When he opened the door, the light from within threw his shadow clear across the yard, and for just a moment Tyrion Lannister stood tall as a king.

A Game of Thrones