Súľov Castle was built in first third of the 15th century. By it’s size, the castle was very small. Its main function was to protect and watching near by road. After 1550 fire it was rebuilt to its original shape and size. In 1730 the castle heads military garrison. There used to be upper and lower castle. Heavy earthquake damage in 1763 accelerated its final destruction. Fortified formation was found in the Súlov castle village area dating from 12th to 13th century.
References:Goryōkaku (五稜郭) (literally, 'five-point fort') is a star fort in the Japanese city of Hakodate on the island of Hokkaido. The fortress was completed in 1866. It was the main fortress of the short-lived Republic of Ezo.
Goryōkaku was designed in 1855 by Takeda Ayasaburō and Jules Brunet. Their plans was based on the work of the French architect Vauban. The fortress was completed in 1866, two years before the collapse of the Tokugawa Shogunate. It is shaped like a five-pointed star. This allowed for greater numbers of gun emplacements on its walls than a traditional Japanese fortress, and reduced the number of blind spots where a cannon could not fire.
The fort was built by the Tokugawa shogunate to protect the Tsugaru Strait against a possible invasion by the Meiji government.
Goryōkaku is famous as the site of the last battle of the Boshin War.