Alferce is a freguesia (parish) in the Monchique Municipality (Algarve, Portugal).

[2] Lies in this area remains of a medieval fortress from Muslim rule in Portugal known in Islamic sources ( Hillah Sirah of Ibn Abbar & others ) as حصن المرجيق - Monchique fortress.

The fortress was captured in 1144 by the followers of Ibn Qasi from the Almoravids.

Less than a century later, it became part of the Kingdom of Portugal who seized the fortress from Ibn Mahfuz ( Aben Mahfot in Spanish sources ) , then leader of the Algarve region & Niebla ( Dawlah Islam fil Andalus - Abdullah bin Inan ).

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