⚠️ A simple half-circle window is not a Diocletian window. The triple division and unequal widths are essential.

| Feature | Description | | :--- | :--- | | | Tall, wide semicircle (half-circle) at the top of a wall. | | Division | Split into 3 vertical sections by two mullions. | | Proportions | Center section is wider than the two side sections (often a 2:1:2 or 3:1:3 ratio of widths). | | Framing | The arch is usually emphasized with a projecting lintel, molding, or brick arch. | | Location | Traditionally placed high on a wall (clerestory level) – not a floor-to-ceiling window. |

If you are studying for an exam, writing a historical report, or designing a Neoclassical building, remember: – that’s a Diocletian window.

The form was rediscovered during the Renaissance by architects like , who studied Roman ruins.

Palladio’s version often featured a wider central section flanked by two narrower lights. Neoclassical and Modern Applications