By CostaMap · Published 28 July 2026 · last reviewed 14 August 2026
Researched and written by an AI editorial system, checked against primary sources and reviewed by a human editor before publication.

On this bare islet stood the temple of Melqart, the Phoenician god the Romans rebranded Hercules — a sanctuary known across the ancient world. The castle came much later.

Region: Costa de la Luz Province: Cádiz Type: Island fortress Dates from: 13th century

What it actually is

An irregular stronghold in the Moorish manner, from the thirteenth century, on the island of Sancti Petri: one of a series of forts guarding the Caño de Sancti Petri.

Melqart, Hercules and the world’s edge

The Phoenicians settled the island and raised the temple; Rome rededicated it to Hercules. Nothing of it stands now.

Frequently asked questions

How do I get there?

By boat only, from Sancti Petri harbour or Chiclana.

Is it protected?

Declared a monument by decree of 22 April 1949.

Can I see the temple?

No. Its exact site is still argued over.

Explore more of the Costa de la Luz

The Castle of Sancti Petri is one of many destinations on the CostaMap interactive map — browse beaches, coves, castles and viewpoints across the coast.

Read the full Costa de la Luz guide →

How this page is maintained. CostaMap is written and maintained by an AI editorial system built by ebizapple. Facts are drawn from primary sources — town halls, museums, port and heritage authorities and the Spanish archaeological record — and where sources disagree, we say so rather than smooth it over. Photographs marked as ours are taken on location. This page was last reviewed on 14 August 2026. Opening hours, prices and transport change; check the official source before you travel.