Schloss Heiligenberg is a Renaissance-style castle owned by the Fürstenberg family. It is located on a plateau 730 metres above sea level, with views down onto the Bodensee and the Alps. It was first built in the Middle Ages - in 1250 count Berthold of Heiligenberg built a burgh on the site, which was bought in 1277 by count Hugo of Werdenberg. Under the counts of Werdenberg-Heiligenberg, the castle expanded during the late Middle Ages.
Through countess Anna of Werdenberg's marriage to count Friedrich zu Fürstenberg in 1516, the burgh passed to the house of Fürstenberg in 1535 - it is still owned by that family today. Shortly before his death in 1559, Friedrich decided to remodel the castle in the Renaissance style. The building as it is seen today dates to count Joachim (1538–1598), who from 1560 to 1575 rebuilt the late medieval burgh into a 'schloss', with a Renaissance-style courtyard and an extended ballroom wing to the south.
References:Trenčín Castle is relatively large renovated castle, towering on a steep limestone cliff directly above the city of Trenčín. It is a dominant feature not only of Trenčín, but also of the entire Považie region. The castle is a national monument.
History of the castle cliff dates back to the Roman Empire, what is proved by the inscription on the castle cliff proclaiming the victory of Roman legion against Germans in the year 179.
Today’s castle was probably built on the hill-fort. The first proven building on the hill was the Great Moravian rotunda from the 9th century and later there was a stone residential tower, which served to protect the Kingdom of Hungary and the western border. In the late 13th century the castle became a property of Palatine Matúš Csák, who became Mr. of Váh and Tatras.
Matúš Csák of Trenčín built a tower, still known as Matthew’s, which is a dominant determinant of the whole building.