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5) Suomenlinna Fortress & its Architect Augustin Ehrensvard: The "Baroque and Rococo Periods" of Europe: 10 Euro Silver coin issued on 18.05.2018
Adds the UNESCO BOOK titled "Treasures of the World" in my personal library:
" Located on islands off Helsinki, Suomenlinna is one of the largest maritime fortresses in the world. Built in the second half of the eighteenth century by Sweden, when Finland was part of the Swedish realm, the purpose was to link and fortify several islands so that entry into the city's harbour couldbe controlled. The work began in 1748 under the supervision of Swedish Admiral Augustin Ehrensvard, who adapted Vauban's theories to the very special geographical features of Helsinki.
By the time of his death in 1772, Ehrensvard had produced the chain of forts, collectively called Sveaborg (Swedish Fortress), that were to protect the approaches to Helsinki.
Following Finland's independence (1918), the name was changed to Suomenlinna (Fortress of Finland) and 6 kms of walls and 190 buildings have been preserved.
Svenborg was built to help Sweden counter the ambitions of Russia, whose principal military and naval base in the Gulf of Finland was Kronstadt, commissioned by Peter the Great to protect the city of St. Petersburg. However, the fortress was occupied by the Russians after the war of 1808-89 despite its reputation as being invulnerable".