Assertion: castle's history | /r/HasAspect | four big periods
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Source sentences:
text: The history of the Kuressaare Castle-Fortress can be divided at least into four big periods, which are popularly called after their former owners: the period of the bishops (first half of 14th century – 1559), the Danish period (1559 – 1645), the Swedish period (1645 –1721), Russian period – 1918).