The first documented mention of the castle was as Regensburg property in 1327. In 1355, Leutold II of Kuenring, the first known owner, died. The Kuenringers were a significant Austrian noble family, named after their seat Kühnring. Leutold's successors, Andre of Lichtenstein and Friedrich of Wallsee, renounced ownership for money, and Eberhard I of Kapellen acquired it in 1359. Subsequent owners included Ernst Preuhofer, the Liechtensteins, Chunrad the Steward, the Öders, Reinprecht V of Walsee, the Hausers, and Christof Zeller of Riedau, who were known as robber barons.
Georg von Wolframsdorf inherited it and around 1530, it passed to the Tannberg family, who sold it to Hans von Tschernembl in 1575. His son, Baron Georg Erasmus von Tschernembl, expanded it in 1608 with Antonio Canevale's design. As a Protestant leader, Georg left the country, and the castle was confiscated in 1620, bought by Count Leonhard Helfried von Meggau. During the Upper Austrian Peasants' War in 1626, the castle was briefly occupied. Later, it belonged to the Starhembergers, Kuefsteiners, and Thurnheim Counts, until 1899, when Baroness Therese von Schwitter owned it. In 1911, Count Alexander Hoyos acquired it, and it remains with his family. Archduchess Alicia, the last Grand Duchess of Tuscany, died there in 1935. After WWII, the Soviets renovated the Chinese Salon.
The castle, located north of Schwertberg where the Aist river exits the Josefstal valley, appears fortified with a design from 1608. Surrounded by the Aist on three sides, it has a Renaissance garden, one of the few of its kind in Austria, and a sundial on a round tower. The main building, partly Gothic and partly Renaissance, features arcades, a falcon kennel, and a chapel dedicated to Saint Mary. The Chinese Salon has wall paintings and a small Rococo library.
Stobi was an ancient town of Paeonia located near Gradsko. It is considered by many to be the most famous archaeological site in North Macedonia. Stobi was built where the Erigon (Crna River) joins the Axios (Vardar), making it strategically important as a center for both trade and warfare.
Stobi developed from a Paeonian settlement established in the Archaic period. It is believed that in 217 BCE, Philip V annexed Paionia during his campaign against the Dardani who had entered Bylazora, the largest Paeonian town.
The city was first mentioned in writing by the historian Livy, in connection with a victory of Philip V of Macedon over the Dardani in 197 BC. In 168 BC, the Romans defeated Perseus and Macedonia was divided into four nominally independent republics. In 148 BC, the four areas of Macedonia were brought together in a unified Roman province. In the reign of Augustus the city grew in size and population.