sentences:  During his reign, Mallu Iqbal tried to recover Jaunpur, but failed.He was succeeded by his younger brother Ibrahim after his death in 1402, who took the title of "Shams-ud-Din Mubarak Shah".The Jaunpur Sultanate attained its greatest height under the younger brother of Mubarak Shah, who ruled as Shams ud-din Ibrahim Shah (ruled 1402-1440).