Tyrion Lannister: Interesting thing about my father... he built our house up from near ruin. He built our army, he built Casterly Rock as we know it, but he didn't build the sewers. That was beneath him, so he gave the job to the lowest person he could find... me. He was right, I was low. The company I kept, low. Women, mostly. They weren't welcome at the Rock. Father disapproved of that sort of behavior. Couldn't walk them through the front gates, I couldn't have them in my chambers, so in the process of building the sewers, I threw in something for myself. It was a passage that began in an out of the way cove by the sea and ended beneath one of the main guard towers.