Lord Tree is the title eventually given to an evergreen tree that stood in King Wasteful V's domain. Due to the king's wasteful habits, he was the last tree standing, and became the only home available to the birds.
When the king orders the Royal Paper Maker to cut down the last tree, the evergreen and his avian inhabitants infiltrate Wasteful's court to warn him that being cut down would mean the royal forest would become the royal meadow. The birds plea from fear of having no place to live, and the kids complain that they'll have no place to swing.
When the king realizes there's only one tree left, and that he wouldn't have any paper after the evergreen is gone, he sees the error of his ways. After he promises to drop his pine cones so that a new royal forest can grow, the monarch names the tree, Lord Tree.