Architecture of Castel Sant’Angelo
Castel Sant’Angelo is a striking blend of Roman imperial design and medieval military architecture, evolving dramatically over nearly two millennia. Originally constructed in 135–139 AD by order of Emperor Hadrian, the structure began as a mausoleum—featuring a massive cylindrical drum atop a square base, once crowned with a bronze statue and encircled by a garden and golden quadriga.
As Rome’s needs changed, so did the castle. By the 5th century, it was incorporated into the Aurelian Walls, and over time transformed into a fortified bastion. During the 14th–16th centuries, successive popes added battlements, drawbridges, spiral ramps, and luxurious Renaissance-style papal apartments, blending form with function.
Topped today by the imposing bronze statue of Archangel Michael, Castel Sant’Angelo is a rare example of a building that reflects layers of Roman, medieval, and Renaissance architecture—all coexisting in a single monumental structure.