Silves: Ancient Islamic Capital of the Algarve

Silves is a city in Faro district, at the heart of the Algarve, perched on a hill overlooking the Arade River, a few kilometres from the coast. Today a quiet municipal seat with just over six thousand inhabitants, it was for centuries the most important city in southern Iberia — the Xelb of Arab geographers, capital of Garb al-Andalus and one of the brightest centres of Islamic culture in the West.

Xelb, the City of Poets

Conquered by Muslims in the early 8th century, Silves flourished thanks to the navigability of the Arade, connecting it to the sea and Mediterranean trade. Arab chroniclers described it as a prosperous, cultured city, renowned for the elegance of its language and the quality of its poets. In the 11th century it became capital of an independent taifa and hosted, while still a prince, al-Mu’tamid — the last Abbadid king of Seville and himself a poet — whose name became forever associated with the city.

From this golden age remains Portugal’s most imposing Islamic heritage: the red sandstone Castle of Silves, the largest Muslim fortress in the Algarve, with its nearly intact walled perimeter and a remarkable Almohad cistern carved into the rock. Archaeological excavations within the grounds continue revealing Xelb’s urban layout and daily life, making the city one of Portugal’s richest sites of Islamic archaeology.

Few places in Portugal so physically embody the encounter of two civilisations: the same hill that supported the Muslim alcazaba later saw the Christian cathedral rise over the main mosque.

From Christian Conquest to Medieval Cathedral

Silves’ integration into the Kingdom of Portugal was slow and contested. In 1189, King Sancho I took the city with support from northern European crusader fleets, but the Almohads recaptured it two years later. Only in 1242, with Paio Peres Correia, did the stronghold fall definitively to Christian hands; in 1266, King Afonso III granted it a charter. As former capital, Silves retained the seat of the Algarve bishopric, and over the old mosque rose Silves Cathedral, the region’s most notable Gothic building, a bishops’ pantheon and symbol of the new religious order.

This layering of cultures — Phoenician, Roman, Islamic and Christian — makes Silves a prime example of Moorish and Islamic heritage in the peninsula. At the city’s entrance stands the Cruz de Portugal, a white limestone calvary from the late 15th century, classified as a National Monument and traditionally linked to the transfer of King João II’s remains, who died in Alvor in 1495 and was temporarily buried in Silves Cathedral.

A City-Archive

With the silting of the Arade and the transfer of royal power to Lagos and later Faro, Silves declined from the 16th century. Paradoxically, this preserved its historic fabric: the walls, narrow streets and buried remains were spared major reconstructions. Today, the red city of the Arade reads like an open-air archive, where each layer — from Almohad rammed earth to Gothic masonry — narrates a chapter in southern Portugal’s long history.