From 1593–97, under the rule and by order of Sebastian Grabner, a Lutheran, most of the Gothic Rosenburg was demolished and the castle was reconstructed in Renaissance style with 13 towers.
Troubles beset the area in 1611 when the Counter Reformation caused yet another change in landlords.
That was when the Roman Catholic Cardinal Franz von Dietrichstein (1570 – 1636) gained control of the Rosenburg.
In 1614 Rosenburg he further expanded to include tournament grounds and 46 arcades.

The cardinal’s tenure did not please the local Protestants, for in 1620, the castle was besieged and finally conquered by Lutheran troops of the "Horner Bund" ("Horn Union", referring to the nearby town of Horn).

Finally, the Rosenburg became the property of the House of Sprinzenstein.
When Countess Maria Regina von Sprinzenstein married Count Leopold Graf Hoyos in 1681, the two dynasties merged and the new landlords of the Rosenburg were now called "von Hoyos-Sprinzenstein".

A period of neglect followed, then several tragedies struck.
Lightning caused a fire in 1721, and another fire broke out in 1751 which destroyed part of the courtyard gate and the chapel.
In 1800, another fire damaged the Rosenburg; it was barely used for some 60 years thereafter.
Fortunately, the Romantic Era caused a renewed interest in castles, and the castle was renovated by Count Ernst Carl von Hoyos-Sprinzenstein senior rebuilt the castle at great personal expense between 1859 and 1889.
The castle is now a museum.
From 1593–97, under the rule and by order of Sebastian Grabner, a Lutheran, most of the Gothic Rosenburg was demolished and the castle was reconstructed in Renaissance style with 13 towers. Troubles beset the area in 1611 when the Counter Reformation caused yet another change in landlords. That was when the Roman Catholic Cardinal Franz von Dietrichstein (1570 – 1636) gained control of the Rosenburg. In 1614 Rosenburg he further expanded to include tournament grounds and 46 arcades.
The cardinal’s tenure did not please the local Protestants, for in 1620, the castle was besieged and finally conquered by Lutheran troops of the "Horner Bund" ("Horn Union", referring to the nearby town of Horn). 
Finally, the Rosenburg became the property of the House of Sprinzenstein. When Countess Maria Regina von Sprinzenstein married Count Leopold Graf Hoyos in 1681, the two dynasties merged and the new landlords of the Rosenburg were now called "von Hoyos-Sprinzenstein". 
A period of neglect followed, then several tragedies struck. Lightning caused a fire in 1721, and another fire broke out in 1751 which destroyed part of the courtyard gate and the chapel. In 1800, another fire damaged the Rosenburg; it was barely used for some 60 years thereafter. Fortunately, the Romantic Era caused a renewed interest in castles, and the castle was renovated by Count Ernst Carl von Hoyos-Sprinzenstein senior rebuilt the castle at great personal expense between 1859 and 1889. The castle is now a museum.
Rosenburg