The history of the area goes back to the time of the Celts and the Romans. The unique lapidary (collection of Roman stone monuments) on the outer wall of the upper floor of the castle bears witness to this.
Seggau Castle was the representation seat of the Styrian bishops until 1786 and also their summer residence until the 20th century. For many centuries the castle served as a bishop's mensal property for the maintenance of the respective bishop of the Diocese of Seckau and his representational duties. It was also a central employer for the region and meeting place on many occasions.
The High castle was built by the archbishops of Salzburg (Konrad I) as a mission and administrative bastion from the 11th century and enlarged by the bishops of Seckau from 1218. In its inside it holds outstanding artistic treasures.
The so-called "prince rooms" are among the most impressive of the castle and are located on the second floor of the High Castle. As princely-episcopal representation rooms they represent a true jewel of arts with their closed baroque furnishings and are known far beyond the country's borders.
"Seggau Castle" is also the home of the largest historical bell in Styria: the so-called "Seggauer Liesl". It is still rung by hand at 12noon on Sundays and public holidays. The baroque castle chapel (Lady chapel) and the modern Michael's chapel with works by contemporary Styrian artists are particularly appealing in their contrasts.