5000 BC, man had cultivated already in the area of Sligo and survived the long winter months thanks to the breeding of oysters and other molluscs and shellfish.
Approximately 5km to the south of the regional airport, you will find the largest site of megalithic tombs in Europe, it is a paradise for amateurs of archaeology, and for simply curious visitors, it is a good occasion to discover the life of prehistoric man.
The town of Sligo was founded in the time of the Vikings, the abbey and the castle were established in the 13th century. Many castles were built at that time in the county.
Owing to the fact that Sligo is on a strategic site, on the road which leads to north, the county was often victim of the attacks of the heads of clans and English. In 1558, ships of the Spanish Armada were destroyed during a storm off Streedagh Beach. Certain Spaniards succeeded in escaping the English and returned to Spain.
The county also played a role in the war of Rebellion in 1798, the Franco-Irish army had succeeded in pushing back the English. A statue to the memory of Bartholemew Teeling was erected in the town of Collooney for its role in this battle.
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