Sergiev Posad, Russia
1337
Saint Petersburg, Russia
1710
Yaroslavl, Russia
1506-1516
Suzdal, Russia
1352
Kirillov, Russia
1397
Istra, Russia
1656
Moscow, Russia
1591
Pskov, Russia
1473
Aleksandrov, Russia
1565
Kostroma, Russia
1330
Rostov, Russia
14th century
Veliky Novgorod, Russia
12th century
Solovetsky, Russia
ca. 1436
Valaam, Russia
Late 1300s
Vologodskaya oblast, Russia
1398
Ostashkov, Russia
1594
Tikhvin, Russia
1560
Pskov, Russia
12th century
Vologda, Russia
1371
Pereslavl-Zalessky, Russia
14th century
Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.