Olsborg Castle, also Olofsborg, was as a fortified castle located on a steep cliff, and might previous to later use been an early hill fort. It was constructed in 1503 or 1504 by the squire Nils Ragvaldsson from Åby, after a recent Swedish attack on Viken. Most of it was destroyed shortly after, when the commander of Bohus Fortress Otto Rud attacked on Christmas night 1504.
After the turmoil created by the dethronement of the Danish king Christian II, the Swedes returned, seized the area and reconstructed Olsborg's fortifications. The brief Swedish rule of northern Bohuslän was administrated from Olsborg by the nobles Lars Siggesson (Sparre) and Ture Jönsson (Tre Rosor), between 1523 and 1525. In 1525, the administration was moved to Karlsborg Castle, south of Hamburgsund. During these years, the castle defenses were improved, especially in 1526. During Christian II's attempt to retake his throne, the part of Bohuslän under Swedish rule was attacked, and both Karlsborg and Olsborg were destroyed by Norwegian forces in December 1531.
Decades later, several attempts to rebuild the castle was made by Sweden. Eric XIV in 1564 and Johan III in 1569 and 1570 both tried, but the attempts were unsuccessful and the castle remained in ruins. The ruins were still clearly visible during the early 20th century, when they were excavated by Wilhelm Berg, who also excavated other castles in the province, such as Ragnhildsholmen Castle and Dynge Castle.References:
The Beckov castle stands on a steep 50 m tall rock in the village Beckov. The dominance of the rock and impression of invincibility it gaves, challenged our ancestors to make use of these assets. The result is a remarkable harmony between the natural setting and architecture.
The castle first mentioned in 1200 was originally owned by the King and later, at the end of the 13th century it fell in hands of Matúš Èák. Its owners alternated - at the end of the 14th century the family of Stibor of Stiborice bought it.
The next owners, the Bánffys who adapted the Gothic castle to the Renaissance residence, improved its fortifications preventing the Turks from conquering it at the end of the 16th century. When Bánffys died out, the castle was owned by several noble families. It fell in decay after fire in 1729.
The history of the castle is the subject of different legends. One of them narrates the origin of the name of castle derived from that of jester Becko for whom the Duke Stibor had the castle built.
Another legend has it that the lord of the castle had his servant thrown down from the rock because he protected his child from the lords favourite dog. Before his death, the servant pronounced a curse saying that they would meet in a year and days time, and indeed precisely after that time the lord was bitten by a snake and fell down to the same abyss.
The well-conserved ruins of the castle, now the National Cultural Monument, are frequently visited by tourists, above all in July when the castle festival takes place. The former Ambro curia situated below the castle now shelters the exhibition of the local history.