In 1311, Teutonic mercenaries called Landsknechts set up a camp on the high banks of the Angrapa River, close to where it flows into the Inster River. Later, in 1337, the Teutonic Knights built a brick castle in the same location. Most of the construction works had been completed by 1347. The fortress was named Insterburg Castle.
For many centuries to follow, Insterburg Castle was a bastion located in the easternmost parts of the Teutonic State, from which raids against Lithuania were waged. Originally, Insterburg Castle was meant to serve as a seat for the local commander, known as komtur. But this plan had to be revoked, as the fortress was constantly threatened by enemy. As a result, the castle was run by a Teutonic procurator, and in the 14th - 15th centuries it became an important military base. In the administrative division, Insterburg belonged to the commandry of Königsburg.
From 1643 to 1647, Maria Eleonora, a sister of the Prussian Prince Elector George Wilhelm, spent her best days at Insterburg Castle, after her royal husband, King of Sweden, Gustaw Adolf, had died. Following the death of her husband, Queen Maria Eleonora had to leave Sweden due to a conflict with her daughter, Queen Christina.
In 1812, the castle was visited by the French Emperor, Napoleon Bonaparte. Napoleon stopped here on his way to Russia, where he was going to take personal command over his armies. In 1814, Elisabeth Alexeievna, the wife of Tzar Alexander I of Russia (1777-1825) was passing through Insterburg. In 1689, Insterburg became the place of the death and burial of Anchen von Tarau, a heroine of a well known East Prussian song.
Today the castle, which lies in the centre of the town of Chernyakhovsk is no more but a picturesque ruin. The north section of the castle outward yard had more luck as its building have survived and now house a museum. On the square in front of the museum local enthusiasts and artists such as singers and musicians organise concerts, contests and other cultural events. And most importantly, hope lingers on in the town that one day the castle will be reconstructed.References:
Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.