a. Marvelous Land of Oz
Oz writer L. Frank Baum was born on May 15, 1856.
He wrote 14 Oz books. For the second book in the series, Dorothy was replaced by a boy named Tip, who had to fight off a different witch named Mombi.
It turns out Tip was secretly the long-lost princess Ozma in disguise. In later stories, she and Dorothy would become good friends.