What is the main conflict in Crispin: The Cross of Lead by Avi?

The novel's conflict is centered around a young boy called Crispin, who is declared a fugitive by the steward of his village. Forced to run away, Crispin is hunted by the steward and his men. He meets a friend called Bear and travels with him to the city, where he learns the truth about himself and manages to win his freedom.