Are there any sort of backstories for housecarls? It would be interesting to know how most housecarls become such, there does not seem to be much lore concerning how housecarls come to be. A housecarl like Irileth makes sense, she and Jarl Balgruuf fought together, and after saving each-others lives she pledged herself as his housecarl. But a housecarl like Lydia is quite young, and begs many questions, like are some housecarls taken from the hold at a young age and trained to serve thanes? It would also seem that most housecarls are slaves.