The Ducal Castle in Szczecin was the seat of the dukes of Pomerania-Stettin of the House of Pomerania (Griffins), who ruled the Duchy of Pomerania from 1121 to 1637. Barnim the Great of Pomerania-Stettin erected the castle within Szczecin's walls against the will of the burghers in 1346. An older Pomeranian burgh had been leveled in 1249. In 1490 the castle was partially reconstructed for Boguslaw X's wedding with Anna Jagiellonka (daughter of king Casimir IV Jagiellon).
Between 1573−1582 the castle was rebuilt again, this time in the mannerist style for duke John Frederick by Italian stonemasons according to design by Wilhelm Zachariasz Italus. Two new wings were added to close the courtyard before the medieval southern and eastern wings. The main gate was adorned with ducal crest, the eastern wing was enhanced and the northern wing was intended for chapel.
In 1648, due to the tenets of the Peace of Westphalia, the castle become a seat of Swedish governor. Before 1705 another reconstruction occurred to prepare the castle for Queen of Poland - Catherine Opalinska, who lived here with her daughters Anna and Marie Leszczynska (future Queen of France) and a small court between 1705-1711. In 1711 king Stanislaw Leszczynski, who sought refuge before chasing him Saxon and Russianforces, joined his wife and daughters at the castle.
After the Great Northern War, in 1720, the city of Szczecin become a Prussian property and the castle was allocated to the garrison commander Christian August, Prince of Anhalt-Zerbst, whose daughter was Sophie Friederike Auguste (future Catherine II of Russia). Under Prussian rule in the 19th century many renaissanse elements in the castle were devastated (arcades, attics, vaulting). Eventually about 60% of the castle was destroyed during World War II (August 1944). Shortly after the war between 1958–1980, it was rebuilt with some modifications. The castle was restored to its original 16th century appearance according to 1653 engraving by Matthäus Merian (among others).
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.