The castles of Spain are not a single invention: they are the result of centuries of war, frontiers, prestige and territorial control. From prehistoric hillforts to today’s Paradores, each era left a different kind of fortification.
8th c. BC – 1st c. BC
Pre-Roman: hillforts and oppida
Iberians, Celts and Celtiberians built castros (hill settlements with walls) and large oppida. They were not lordly castles, but they already served collective defence and control of passes. Materials: dry stone, palisades, ditches.
Types: hilltop castro, walled oppidum, tribal watchtower.
1st c. BC – 5th c.
Rome: castra and urban walls
Rome brought the legionary camp (castra), towers, monumental gates and ashlar walls. Many cities (Tarragona, Lugo, Zaragoza, León…) later reused Roman layouts in the Middle Ages.
Types: castrum, urban wall, corner tower, arched gate.
8th – 11th c.
Al-Andalus and the Christian frontier
After 711, alcazabas (urban military compounds), alcázares (fortified palaces) and dense networks of watchtowers were built. In the Christian north, from the 9th–10th centuries, stone towers and castles consolidated lordships against raids. Core motive: war and frontier.
Types: alcazaba, alcázar, watchtower, hisn (Andalusi castle), early keep.
11th – 13th c.
High Middle Ages and the Reconquista
Golden age of the Iberian castle. Kings, lords and military orders (Temple, Hospital, Calatrava, Santiago, Alcántara) raised fortresses to hold passes, control populations and project power. Curtain walls with outer baileys, dominant keeps, Romanesque/early Gothic style, and strong Mudéjar brick influence appear.
Types: rock castle, plain castle with moat, military-order convent-castle, albarrana tower, barbican.
14th – 15th c.
Palace-castles and Isabeline Gothic
As the frontier moved away, many castles became more residential: halls, decoration and comfort, without fully losing defence. Mudéjar brick (Coca, La Mota) and Isabeline Gothic marked noble taste. Artillery began to force lower, thicker walls.
Types: palace-castle, Mudéjar brick castle, manorial tower, fortified residences.
16th – 18th c.
Artillery and bastioned forts
Gunpowder made many medieval towers obsolete. Bastioned forts (geometric trace, bastions, wide ditches) designed against cannon took over. Part of the medieval stock was abandoned, quarried, or turned into barracks or prisons.
Types: citadel, bastioned fort, bastion, ravelin, fortress town.
19th – 21st c.
Romanticism, restoration and tourism
Romantic taste rediscovered the castle as a symbol. Reconstructions, monument catalogues and protection laws followed. Today they are museums, Paradores, film locations, wedding venues or private homes. Spain holds one of Europe’s richest fortified heritages — that is why “castles of Spain” is such a strong cultural search.
Uses today: cultural visit, hotel, events, filming, private home, consolidated ruin.
Castle types you will see in this guide
AlcazabaUrban Andalusi military compound
AlcázarFortified palace, often royal
Rock castleOn a natural spur or crag
KeepDefensive and symbolic core
MudéjarBrick and Islamic tradition in Christian lands
Military orderConvent-fortress (Temple, Calatrava…)
BastionedEarly modern, against artillery
WatchtowerLookout and signal tower