The Mosque-Madrassa of Sultan Hassan is a massive Mamluk era mosque and madrassa located near the Citadel in Cairo. Its construction began 757 AH/1356 CE with work ending three years later "without even a single day of idleness". At the time of construction the mosque was considered remarkable for its fantastic size and innovative architectural components. Commissioned by a sultan of a short and relatively unimpressive profile, al-Maqrizi noted that within the mosque were several "wonders of construction".