The manor of Ekolsund was established in the 1300s. The first known owner was the council Magnus Knutsson, mentioned in 1351. In the 1500s the castle came into royal hands when King Gustav Vasa took over the ownership. It was in 1578-1611 the residence of Princess Sophia of Sweden.
The crown anyway donated Ekolsund to Åke Tott in 1618. Ekolsund was moved again to the Crown during Karl XI’s reduction, and in 1716 it was appointed to Landgraf Fredrik of Hessen-Kassel (later Fredik I). In 1747 it was sold to Prince Adolf Fredrik on the account of the new heir Gustav (later Gustav III). In 1785, Ekolsund was sold from the hands of the Crown to George Seton, a man of Scotish heritage. In 1917 it was bought by Carl Kempe. In 2002, Ekolsund was bought by a private firm.
Both southern and northern castle was built in the middle of the 1600s, excedran came centuries later. Architects were Simon de la Vallée, Nicodemus Tessin the Elder, Carl Harleman, Carl Fredrik Adelcrantz and Jean Eric Rehn.References:
Sirmione castle was built near the end of the 12th century as part of a defensive network surrounding Verona. The castle was maintained and extended first as part of the Veronese protection against their rivals in Milan and later under the control of the Venetian inland empire. The massive fortress is totally surrounded by water and has an inner porch which houses a Roman and Medieval lapidary. From the drawbridge, a staircase leads to the walkways above the walls, providing a marvellous view of the harbour that once sheltered the Scaliger fleet. The doors were fitted with a variety of locking systems, including a drawbridge for horses, carriages and pedestrians, a metal grate and, more recently, double hinged doors. Venice conquered Sirmione in 1405, immediately adopting provisions to render the fortress even more secure, fortifying its outer walls and widening the harbour.
Thanks to its strategical geographical location as a border outpost, Sirmione became a crucial defence and control garrison for the ruling nobles, retaining this function until the 16th century, when its role was taken up by Peschiera del Garda.