The Adhai-din-ka-Jhonpra, at Ajmer, is believed to have been built in just two-and-a-half days, thus named Adhai-din. Another belief is that its name is attributed to a two-and-a-half day fair held nearby each year.

The mosque is entered through a simple gateway in the north, on whose right stands a ruined minaret. The gate takes one to a stairway leading up to a small tower from where the muezzin (mosque official) calls the faithful to prayer. The facade consists of a numberof small arches built of yellow limestone. The main arch is flanked by six smaller arches of Arab origin wherein tiny rectangular panels allowed for a lighting system, a feature found in ancient Arabian mosques.