Diocletian Windows (BEST BREAKDOWN)

| True Diocletian Window | Plain Semicircular Window | | :--- | :--- | | Divided into by 2 mullions | One single, undivided arch | | Center light is wider | All sections equal (or just one pane) | | Often has a pronounced arch frame | May be flush with wall |

Within the Palace of Diocletian, specifically in the southern facade overlooking the sea, large windows were constructed to light the state apartments and the Great Hall (the salones ). These were not merely decorative; they were engineering necessities. The Romans had mastered the use of the arch to support heavy masonry walls. By placing a semicircular arch above a flat opening, they could distribute the weight of the wall downward while allowing a significant amount of light to enter the deep, cavernous rooms of the palace. The design became associated with the grand Imperial baths ( thermae ) of Rome, hence the alternative name "thermal windows." diocletian windows

Palladio integrated the Diocletian window into the façades of Venetian churches, such as San Francesco della Vigna . | True Diocletian Window | Plain Semicircular Window