This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
In 1154, the Zengid ruler Nur al-Din Mahmud ibn Zangi built a hospital in Damascus that did two things at once: it treated the sick free of charge, and it trained the physicians who would go on to treat the next generation of the sick. The bimaristan that bears his name is one of the best-preserved examples anywhere of how medieval Islamic medicine actually worked as an institution, not just a body of texts. Tradition holds that more than a century later, the Mamluk sultan Qalawun, campaigning against the Crusaders, fell seriously ill and recovered after treatment at Nur al-Din's hospital, an experience credited with inspiring Qalawun to build his own, much larger hospital complex in Cairo decades afterward. Historians treat that story as tradition rather than documented fact, the way founding legends often outlast the paperwork that would prove them. What is not legend is the building itself, restored in 1975 and open today as a Museum of Arabic Medicine and Science, still standing on the same site where it once treated Damascus's poor for nothing, eight centuries before the word insurance meant anything to medicine at all.