Who is David from A Tale of Three Kings and what is their importance?

David is the youngest son of a shepherd. David is given the job of watching over the sheep. This is a lonely job, but David passes the time by communing with the sheep and learning how to throw rocks. Soon this talent of throwing stones comes in handy when David uses it to save a sheep from a bear. Later, David will use his talent with stones to kill a giant named Goliath who has been tormenting the local village. David becomes a folk hero for this action, but does not like the attention it gives him.