It was demolished in 1367 by order of King Albert, as the local residents complained of heavy taxation for the upkeep of the castle.

[1] Kokemäki Castle was the administrative centre of Kokemäenkartano slottslän.

Its function was similar to that of the castles of Turku, Häme and Vyborg, which are still preserved today.

Various items were found which were dated to the late Bronze Age, as well as to the 13th and 14th century.

It was probably built 1.5 kilometres (0.9 mi) upstream at the same location as the later Kokemäenkartano manor.