Frýdberk, now known as Žulová, is a medieval castle ruin located in the town of Frýdberk – currently Žulová, within the Olomouc Region of the Czech Republic. The site features a prominent bergfrit that was later integrated into a church tower and stands as a cultural monument of the Czech Republic. Originally built to control the border between Silesia and Moravia, Frýdberk played significant roles in regional conflicts throughout its history.

The origins of Frýdberk trace back to the 13th century when it was constructed as a castle. The first documented mention dates from this period, highlighting its early importance. By 1358, the settlement had grown enough to be referred to as a town and became part of the Duchy of Nysa under Bohemian suzerainty. During the 15th century, Frýdberk experienced economic prosperity with silver mining operations and two glassworks in operation. The castle underwent significant reconstruction in the Renaissance style in 1594, reflecting its continued importance.

Architecturally, Frýdberk's design was typical of medieval fortifications, featuring an oval core surrounded by a wall with a free-standing bergfrit. Although much of the original structure has not survived, this bergfrit remains up to 4 meters thick and stands as a testament to its past grandeur. In the late 16th century, Bishop Martin Gerstmann initiated significant reconstruction efforts, which further shaped the castle's appearance.

Ownership of Frýdberk changed hands several times throughout history. Notable owners included Jan z Wüstehube in 1325, who donated part of his estate as penance, and Jindřich Haugvic by 1340. In 1358, Bishop Přeclav z Pohořelé purchased the castle, marking a shift from its earlier reputation as a robber's den. Over time, other figures such as Barbora Schwetlingová and Martin Gerstmann also played roles in its history.

Key events at Frýdberk include its capture and destruction by Swedish and Polish forces in 1639 during the Thirty Years' War. This event marked a significant turning point, leading to the town's decline. However, Frýdberk experienced recovery and expansion in the latter half of the 17th century, with town privileges restored in 1793.

Today, visitors can explore the remnants of Frýdberk's historical significance. The site is accessible and offers a glimpse into its storied past through the surviving bergfrit and other cultural monuments like the Church of Saint Joseph, built using materials from the castle ruins. Additionally, nearby attractions such as the Church of Our Lady of Sorrows on Boží hora Hill provide further context to the region's rich history.

Frýdberk stands as a testament to the dynamic history of the Czech lands, reflecting both its medieval origins and subsequent transformations through centuries of conflict and change. Its preservation as a cultural monument invites visitors to explore and appreciate this unique piece of heritage nestled in the picturesque landscapes of the Olomouc Region.