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".[1] The mosque was, for example, designed to include schools for all four of the Sunni schools of thought: Shafi'i, Maliki, Hanafi and Hanbali.

Little information is available about the construction of the mosque of Sultan Hasan. The most substantial source available is al-Maqrizi writing six decades later. He had access to administrative documents that are unavailable to historians today. Maqrizi mentions that the construction of the mosque cost 30,000 dirham every day, making it the most expensive mosque in medieval Cairo. Financing for the mosque was paid for by the austerity of Manjaq, by Shaykhu's wealth, and by extortion from subjects. Even the Sultan may have considered the mosque of too great an expense. al-Maqrizi noted that a eunuch said he heard the Sultan say "if it were not that the king of Egypt would be called incapable of finishing a building that he had started, then I would stop building this mosque on account of the greatness of what is spent on it".

An inscription on the mosque notes the name of emir Mohammed ibn Biylik, the supervisor of the construction of the mosque. Unusually his name was placed near Sultan Hasan's in the inscription. Placing the supervisor's name alongside the patron's demonstrated how massive an undertaking the mosque was. The emir's high standing otherwise was another indication of this prestige. Mohammed was involved in the construction of several other important structures in Cairo including the Hippodrome. Other labor for the mosque might have been restricted by the population loss of the Black Death, but as this was such a large undertaking, it attracted craftsmen from all over the Mamluk Empire.

The construction of the minarets is of particular interest. Plans called for four minarets, but only three were ever constructed. One of the minarets collapsed and three hundred people were killed. Al-Maqrizi noted that the minaret's fall ignited conversation across Cairo and Fustat about the impending downfall of the state. Al-Maqrizi noted also that a poet wrote lines in response that said that the fall of the minaret meant that God was present in it. Interestingly, the conversations in the public came to fruition. Sultan Hasan's assassination followed the minaret's fall by thirty-three days. Construction of the mosque continued after the Sultan's death, but it still was never completed.

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