Following incursions of Saracens and the razing of the old town of Glandèves, which became a bishopric no later than the sixth century, the more defensible site of medieval Entrevaux was founded in the 11th century on the rocky spur in an angle of the river; the oldest recorded name is Interrivos and dates from 1040.
In 1536, Entrevaux fell to the troops of Charles V, Holy Roman Emperor, betrayed by its lord Jacques Glandeves; half the population was massacred. The remaining population staged an uprising, cutting the throat of the governor, and offered the town to the French Dauphin, King François I. In recognition of this, Entrevaux was given the Municipal charter (city law model) of Avignon and declared a royal town of France, with its inhabitants exempt from taxation.
n 1690 the military architect Vauban drew up plans to further fortify the town, due to its strategic position guarding the valley of the Var and on the border with Savoy. Although not completed in full, the citadel perched high above the town was strengthened, particularly on the more accessible side closest to the hilltops, and a protected walkway constructed up the side of the mountain from the town.
The citadel was last used during World War I as a prison for German officers. At the heart of this fortress perched 156 meters above the village, step back in time and imagine life in the dungeon, its former dungeons and its underground passages.
Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.