During the month of Ramadan, on Tuesday, June 26, 1787, two hours after the afternoon prayer, or about 5:30 p.m., an “alarmingly dreadful event” (ḥāditha mahūla muz‘ija) occurred in Cairo. An explosion ripped through the heart of the city's commercial district, sparking a massive fire, toppling buildings, killing dozens, and pulsing buckling ripples and emotional shockwaves through the city. Late 18th-century urbanization produced countless such disasters around the world. This one occurred at a particularly trying time for Cairo, and Egypt generally, and serves as a barometer of Egyptian society and the economy in this period.