For this reason Kronborg Castle was of great significance, not just for Denmark, but for all major seafaring nations. In 1574 King Frederik II began the construction of the outstanding Renaissance castle and the surrounding fortifications, which would eventually be known as Kronborg Castle. Kronborg Castle was admired for its beauty as a castle and feared for its strength as a fortress. Criterion (iv): Kronborg Castle is an outstanding example of the Renaissance castle, and one which played a highly significant role in the history of this region of northern Europe. The management plan for Kronborg Castle has been prepared and addresses the long term threats against Kronborg.