History of Sweden between 12000 BC - 4001 BC
The Pleistocene glaciations scoured the landscape clean and covered much of it in deep quaternary sediments. Therefore no undisputed Early or Middle Palaeolithic sites or finds are known from Sweden. As far as it is currently known, the country's prehistory begins in the Allerød interstadial c. 12,000 BC with Late Palaeolithic hunting camps of the Bromme culture at the edge of the ice in what is now the country's southernmost province. Shortly before the close of the Younger Dryas (c. 9,600 BC), the west coast of Sweden (Bohuslän) was visited by hunter-gatherers from northern Germany. This cultural group is commonly referred to as the Ahrensburgian and were engaged in fishing and sealing along the coast of western Sweden during seasonal rounds from the Continent. Currently, we refer to this group as the Hensbacka culture and, in Norway, as the Fosna culture group. During the late Preboreal period, colonization continued as people move towards the north-east as the ice receded. Archaeological, linguistic and genetic evidence suggests that they arrived first from the south-west and, in time, also from the north-east and met half-way.
An important consequence of de-glaciation was a continual land uplift as the Earth's crust rebounded from the pressure exerted by the ice. This process, which was originally very rapid, continues to this day. It has had the consequence that originally shore-bound sites along much of Sweden's coast are sorted chronologically by elevation. Around the country's capital, for instance, the earliest seal-hunter sites are now on inland mountain tops, and they grow progressively later as one moves downhill toward the sea.
The Late Palaeolithic gave way to the first phase of the Mesolithic in c. 9600 BC. This age, divided into the Maglemosian, Kongemosian and Ertebølle Periods, was characterised by small bands of hunter-gatherer-fishers with a microlithic flint technology. Where flint was not readily available, quartz and slate were used. In the later Ertebølle, semi-permanent fishing settlements with pottery and large inhumation cemeteries appeared.
The Château d'Olhain is probably the most famous castle of the Artois region. It is located in the middle of a lake which reflects its picturesque towers and curtain walls. It was also a major stronghold for the Artois in medieval times and testimony to the power of the Olhain family, first mentioned from the 12th century.
The existence of the castle was known early in the 13th century, but the present construction is largely the work of Jean de Nielles, who married Marie d’Olhain at the end of the 15th century.
The marriage of Alix Nielles to Jean de Berghes, Grand Veneur de France (master of hounds) to the King, meant the castle passed to this family, who kept it for more than 450 years. Once confiscated by Charles Quint, it suffered during the wars that ravaged the Artois. Besieged in 1641 by the French, it was partly demolished by the Spaniards in 1654, and finally blown-up and taken by the Dutch in 1710. Restored in 1830, it was abandoned after 1870, and sold by the last Prince of Berghes in 1900. There is also evidence that one of the castles occupants was related to Charles de Batz-Castelmore d'Artagnan, the person Alexandre Dumas based his Three Musketeers charictor d'Artagnan on.
During the World War I and World War II, the castle was requisitioned first by French troops, then Canadian and British soldiers. The current owner has restored the castle to its former glory.