Cosmatesque

thumb|260px|Cosmatesque screen at the Basilica di San Giovanni in Laterano. Some works of Deodatus di Cosma for [[Colonna family are housed in the basilica.]]

Cosmatesque, or Cosmati, is a style of geometric decorative inlay stonework typical of the architecture of Medieval Italy, and especially of Rome and its surroundings. It was used most extensively for the decoration of church floors, but was also used to decorate church walls, pulpits, and bishop's thrones. The name derives from the Cosmati, the leading family workshop of craftsmen in Rome who created such geometrical marble decorations.