The town of Becov nad Teplou in the Karlovy Vary region was founded in the 13th century by a noble family from Osek, to whom it belonged for another two centuries. Located on a rocky cape on the site of a trade route, the castle was originally intended to protect this route and collect customs fees, and therefore served as a strategically important fortress and was fortified during rebuilding in the Gothic style (in this form, basically, it survived until today).

The fortress reached its peak in the 15th century. The most valuable part of the castle, which has survived to this day, is the chapel of the Apparition of the Virgin Mary (1400), a chapel decorated with ancient frescoes based on biblical motifs. It was under the floor of this chapel that the reliquary was found. Over time, the owners connected the two most ancient parts of the city, and then built a palace with Renaissance-style arcades - for living and receiving guests. In 1547, the Bechovsky Castle was transferred to the kingdom as retribution for debts.
During the 30 Years' War, the city was occupied by the Swedes. In the years 1654-1652, Bečov was owned by the Questenbergs. On the foundation of the fortifications of those times - a huge bastion above the moat, not far from the deserted castle, they began to build a baroque castle with an octagonal tower. Representation halls, a library and a chapel were built inside the tower. In 1813, the estate was bought by the Belgian Beauforts-Spontini family, who began to rebuild the Plugovskiy Palace in the classical style, and the fortress was used as a barn. In the 19th century, the castle and the castle were combined into one.
Recently, the castle has been completely renovated and opened the exhibition "The History and Significance of Reliquaries". The greatest value is the unique Romanesque reliquary of Saint Maurus, which was found in 1985 in the chapel. In the 12th century, the reliquary was purchased by Alfred de Befort. He restored the treasury and moved it to Bečov. When, at the end of World War II, the Beforts, as active accomplices of the Nazis, quickly left their castle, they hid the relic under the floor, as they hoped for a speedy return. In 1945, for the connection of the Belgian owners with the Nazis, the castle was confiscated and became state property (and the next year it was already open to the public). The valuable monument lay there for more than 40 years. In the 1980s, investigators received an anonymous message that a merchant was offering to take the treasure out of Czechoslovakia. After studying the archives and conducting interrogations, on November 5, 1985, the relic was found - in the basement among bottles of aged wine and cognac. 60 specialists from the Czech Republic and abroad took part in the restoration of the reliquary of St. Maurus. In May 2002, it became available to the public.