Lydia

55

You were being transported town of Helgen for execution, but before they could execute you a huge black dragon appeared and destroyed Helgen, after you ran you came to whiterun and spoke to the Jarl Balgruuf about what you have seen, after tracking down another dragon that was attacking the villagers and took it out you found out by slaying the dragon you absorb its soul. By this you were called the dragonborn, you went back to whiterun and told this to Jarl Balgruuf, he was pleased that the dragon was slain but also surprised on what happened afterwards. So for saving whiterun from the dragon he gave you a new house and a housecarl named Lydia.