A small Mamluk-era complex just north of the Umayyad Mosque, built between 1277 and 1281 as a madrassa and library. The founder, Sultan Baybars I — who famously turned back the Mongol advance at Ain Jalut — is buried in a fine marble tomb inside.
The interior is small but exquisite, with marble panelling, a mosaic frieze and a stalactite cornice. The library holds one of the most important collections of medieval Arabic manuscripts in the world (most are now in a more modern building, but the original reading room is preserved). The complex is open to visitors during daylight hours.