At a Glance
| Where | Lungotevere Castello 50, Rome |
|---|---|
| Original construction | 123–139 AD — Mausoleum of Hadrian |
| Commissioned by | Emperor Hadrian (76–138 AD) |
| Original function | Imperial tomb |
| Height | 48.5 m (from base to angel) |
| Today | Museo Nazionale di Castel Sant'Angelo |
The Mausoleum of Hadrian
The emperor who wanted a monumental tomb
In 123 AD Emperor Publius Aelius Hadrian — the ruler who built the Pantheon and Hadrian's Wall in Britain — ordered the construction of a mausoleum for himself and his dynasty on the right bank of the Tiber. The choice of site was deliberate: the area was connected to the Campus Martius (the heart of imperial ceremonies) via the Pons Aelius, the bridge Hadrian had built specially and which is now called Ponte Sant'Angelo.
Hadrian died in 138 AD, before the work was complete. His successor Antoninus Pius finished the mausoleum in 139 AD and transferred the emperor's ashes there.
The original structure
The original mausoleum was architecturally very different from the current Castel Sant'Angelo. The structure comprised:
- Square base: a podium roughly 89 m on each side in travertine faced with marble
- Cylindrical drum: diameter approximately 64 m, faced in white travertine
- Earth tumulus: planted with cypresses and other trees
- Summit statue: probably Hadrian in a quadriga or a large bronze figure
The original entrance faced the river. The burial chamber, reached via a long spiral corridor (still visitable today), was at the heart of the structure.
The tomb of seven emperors
The mausoleum served as an imperial sepulchre for almost a century. The urns held the ashes of:
- Hadrian (138 AD) and his wife Sabina
- Antoninus Pius (161 AD) and his wife Faustina
- Lucius Verus (169 AD), co-emperor with Marcus Aurelius
- Marcus Aurelius (180 AD) and family members
- Commodus (192 AD)
- Septimius Severus (211 AD) and his family
- Caracalla (217 AD)
The last emperor buried here was probably Caracalla, after whose death the mausoleum lost its funerary function.
From tomb to fortress: late antiquity
Integration into the Aurelian Walls
Between 271 and 275 AD Emperor Aurelian built Rome's great defensive walls (still visible today). Hadrian's mausoleum — owing to its strategic position on the Tiber bank — was incorporated into the defensive system as the north-western bastion of the walls. From this point on it ceased to be a tomb and became a military structure.
The sack of 410 AD
When Alaric and the Visigoths sacked Rome in 410 AD, they also violated the mausoleum and scattered the imperial ashes. It was a symbolically devastating act of desecration: the end of imperial Rome written in the destruction of its emperors' tombs.
The name: Gregory the Great's vision
The name "Castel Sant'Angelo" derives from a legendary episode dated 590 AD. A terrible plague was decimating Rome when Pope Gregory the Great led a penitential procession through the streets. As he crossed the Pons Aelius, the pope had a vision: the Archangel Michael was sheathing his sword on top of the mausoleum, signalling the end of the plague.
To commemorate the vision, a statue of the archangel was placed on the summit and the building was named Castel Sant'Angelo. The current statue — in bronze, by the Flemish artist Peter Anton von Verschaffelt — dates from 1752 and was commissioned by Clement XIII.
The medieval period: popes and fortress
From mausoleum to papal refuge
In the Middle Ages, Castel Sant'Angelo gradually became papal property. As early as the 9th century Pope Leo IV had included it in his defensive perimeter. But it was during the power struggles of the 10th–11th centuries that the fortress took on a crucial role as an emergency refuge for popes in danger.
The Passetto di Borgo
In 1277 Pope Nicholas III had the Passetto di Borgo built: an elevated corridor about 800 m long connecting the Vatican directly to the fortress. The Passetto allowed the pope to reach Castel Sant'Angelo without descending to street level, safe from enemies.
The most dramatic use of the Passetto was in 1527: during the Sack of Rome by the troops of Charles V, Pope Clement VII fled through the corridor while imperial soldiers were sacking the Vatican. The pope remained barricaded in the fortress for months.
The Renaissance castle
Between the 15th and 16th centuries the popes transformed Castel Sant'Angelo into a princely residence. Additions included:
- Papal apartments decorated with frescoes (Sala Paolina, Sala di Apollo)
- Loggias overlooking the Tiber
- Prisons carved out of the ancient structures
- A defensive system with star-shaped bastions
Among the famous prisoners: philosopher Giordano Bruno (held 1593–1600, later burned at the stake), sculptor Benvenuto Cellini (escaped in 1539 in an audacious fashion), and Galileo Galilei (briefly interrogated in 1633).
From castle to museum
In 1901 Castel Sant'Angelo was opened to the public as a museum. In 1925 the Museo Nazionale di Castel Sant'Angelo was officially established, preserving armour, weapons, Renaissance furnishings, paintings, and the papal apartments.
The building, which has traversed almost two thousand years of Roman history, is today one of the most visited museum sites in Italy.
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Frequently Asked Questions
Who built Castel Sant'Angelo? It was built as a mausoleum by Emperor Hadrian in 123–139 AD.
Why is it called Castel Sant'Angelo? Because of Gregory the Great's vision in 590 AD: Archangel Michael reportedly appeared on the summit to signal the end of a plague.
Was it always a fortress? No. First it was an imperial tomb (1st–3rd century), then a defensive bastion (from the 3rd century), then a papal fortress and residence (Middle Ages and Renaissance).
How many emperors were buried here? At least seven, from Hadrian to Caracalla (138–217 AD).
Article no. 101 — TIER S — MON-06 Castel Sant'Angelo Type: HISTORICAL Words: ~1,000