The Battle of Berlengas was fought in 1666 during the Portuguese Restoration War, between the Portuguese defenders of the Fort São João Baptista and a Spanish fleet commanded by Diego de Ibarra. The fleet, which had destroyed Portuguese fisheries, bombarded towns and cut off supplies in one month as part of its onslaught, proceeded to storm the fort on the Berlengas. The fort was destroyed and the entire garrison were captured.

After the attack the repair of the fort was initiated, being concluded in 1678 by João de Mascarenhas, 1st Marquess of Fronteira.

• Darwin Porter, Danforth Prince, Frommer's Portugal (2010) ISBN 978-0-470-54120-3
• Abigail Hole, Charlotte Beech, Portugal (2005) ISBN 978-1-74059-682-4
• Fernández Duro, Cesáreo: Armada española desde la unión de los reinos de Castilla y de León, Vol.5. Est. tipográfico "Sucesores de Rivadeneyra", (1899)
• Brown, Rawdon & Cavendish, George: Calendar of state papers and manuscripts relating, to English affairs, existing in the archives and collections of Venice: and in other libraries of northern Italy, Vol.35. H.M. Stationery office, 1935

39°25′N 9°30′W / 39.42°N 9.50°W / 39.42; -9.50