The Mosque of Sultan Hasan (1356-61). The most monumental of all Cairene mosques, it stands like a fortress across from the Citadel of Cairo. The structure is a four-iwan, four-madrasa composition with a mausoleum right on the qibla axis of the mosque. The huge portal is oriented to impress the viewer coming from the Citadel. Its minarets mark the beginning of the line of development of the 3-tiered Mamluk minarets.