Frances Hodgson Burnett 
The Lost Prince 

A charming legendary romance of today, having for its hero a boy prince in ignorance of his royal station, who traveled through France as a tramp, secretly carrying a sign and a message to stray men in crowded streets, at palace gates, in forests, and on mountain sides, he himself ignorant of all but that he must obey and pass on in silence. A tale of faerie, touched with mysticism, instinct with romance and courage and the spirit of consecration to an ideal of splendid service.