Jahanpanah was the fourth medieval city of Delhi established in 1326–1327 by Muhammad bin Tughlaq (1325–51), of the Delhi Sultanate. To address the constant threat of the Mongols, Tughlaq built the fortified city of Jahanpanah (meaning in Persian: "Refuge of the World") subsuming the Adilabad fort that had been built in the 14th century and also all the establishments lying between Qila Rai Pithora and Siri Fort. Neither the city nor the fort has survived. Many reasons have been offered for such a situation. One of which is stated as the idiosyncratic rule of Mohammed bin Tughlaq when inexplicably he shifted the capital to Daulatabad in the Deccan and came back to Delhi soon after.