The cistern
A double stair down to a cool underground water chamber.
Lansbricae from España — CC BY-SA 2.0 · Falk2 — CC BY-SA 4.0 · Falk2 — CC BY-SA 4.0 · Falk2 — CC BY-SA 4.0
**The oldest Islamic fortress in Spain — built in 835 from reused Roman stone** — at the head of the Roman bridge over the Guadiana. The emir **Abd al-Rahman II** built it in **835** ⚠ **not to protect the city but to control it**: **Mérida had repeatedly rebelled against Córdoba**, ✅ **so the fortress was raised to hold it down and guard the bridge**. ⚠ **Its stone is Roman**: **taken from the ancient city's buildings** — **and in its walls you see carved blocks and Latin inscriptions set upside down**; **spolia plain to the eye**. ✅ **Its most important feature is the cistern (*aljibe*)**: **a double stair descending to a water chamber** ⚠ **fed by filtration from the river** — ✅ **securing water under siege**, **its columns also reused Visigothic work**.
A double stair down to a cool underground water chamber.
Latin inscriptions set upside down in Islamic walls.
The Roman bridge and the river from the walls.
Paseo de Roma, 06800 Merida, Spain
The Temple of Diana**A Roman temple standing with its columns in the middle of a modern street — wi4 minutes walk4.8
National Museum of Roman Art**A red-brick building of immense arches designed by Rafael Moneo — reckoned amo8 minutes walk4.8
The Roman Theatre of Mérida**The best-preserved Roman theatre in Spain — its stage front still standing in 9 minutes walk4.7
The Roman Amphitheatre**An amphitheatre for fifteen thousand, directly adjoining the theatre — with it10 minutes walk4.7
The Acueducto de los Milagros**A file of striped stone-and-brick arches standing in an open field — the name 14 minutes walk4.6**A ruler's fortress within his own city — its function to protect authority from the inhabitants as much as the inhabitants from an enemy.** ✅ **The definition**: an ***alcazaba*** is a walled fortress inside a city or on its edge, ⚠ **housing the governor and his garrison**, **with its own walls, gates, cisterns and stores** — **a small self-sufficient town inside the larger one**. ✅ **The double function**: **external defence**, of course, ⚠ **but also — and here chiefly — **internal control**: **if the inhabitants rose, the ruler withdrew into the alcazaba and held out** until relief arrived. ✅ **Mérida is an explicit case**: ⚠ **it rebelled against Córdoba repeatedly in the 9th century** — **so Abd al-Rahman II built the alcazaba in 835 after suppressing a revolt**, ✅ **placing it at the bridge so as to command the crossing as well**; **it watches the city and the river together**. ⚠ **The pattern is general**: **the alcazabas of Granada, Málaga, Almería, Algiers and Rabat** — ✅ **all positioned to command their cities**. ✅ **The word passed into Spanish as *alcazaba*** and from there into other languages, **as did *alcázar* (from *al-qasr*, the palace)** — ⚠ **the difference being that an alcázar is a fortified palace, and an alcazaba a fortress first**.