DIOCLETIAN WINDOW

window with a somewhat rounded top, or head, and bronze-framed panes of glass, named after those in the palace of the 3rd-century Roman emperor Diocletian at Spalato (Split, Croatia) and in the Baths of Diocletian, Rome (now the church of Sta. Maria degli Angeli). The window was used again in the 16th century, especially by Andrea Palladio, and in the late 18th century by Robert Adam.