anchor: During the supremacy of the Barbary Coast pirates in the 16th and 17th centuries, Formentera was so vulnerable it had to be abandoned, and it wasn't resettled until the 18th century.
positive: Formentera was so vulnerable it had to be abandoned in the 16th and 17th centuries.
negative: The supremacy of the Barbary coast pirates was settled in the 14th century.