The Sultan's Rival: A Story For Boys is a historical fiction novel written by Bradley Gilman and published in 1911. The story takes place in the Ottoman Empire during the 16th century and follows the adventures of two young boys, Yusuf and Mustafa. Yusuf is the son of the Grand Vizier, while Mustafa is the son of a wealthy merchant. The boys are best friends, but their friendship is tested when they both fall in love with the same girl, the daughter...